diff --git a/Source/JavaScriptCore/heap/MachineStackMarker.cpp b/Source/JavaScriptCore/heap/MachineStackMarker.cpp
index c914f07c29286..99a70fdf3efcd 100644
--- a/Source/JavaScriptCore/heap/MachineStackMarker.cpp
+++ b/Source/JavaScriptCore/heap/MachineStackMarker.cpp
@@ -27,7 +27,6 @@
 #include <wtf/BitVector.h>
 #include <wtf/PageBlock.h>
 #include <wtf/StdLibExtras.h>
-#include <wtf/ConservativeScanStackGuards.h>
 
 namespace JSC {
 
@@ -45,7 +44,7 @@ void MachineThreads::gatherFromCurrentThread(ConservativeRoots& conservativeRoot
         conservativeRoots.add(registersBegin, registersEnd, jitStubRoutines, codeBlocks);
     }
 
-    conservativeRoots.add(currentThreadState.stackTop, WTF::ConservativeScanStackGuards::updatedStackOrigin(currentThreadState.stackTop, currentThreadState.stackOrigin), jitStubRoutines, codeBlocks);
+    conservativeRoots.add(currentThreadState.stackTop, currentThreadState.stackOrigin, jitStubRoutines, codeBlocks);
 }
 
 static inline int osRedZoneAdjustment()
diff --git a/Source/WTF/wtf/CMakeLists.txt b/Source/WTF/wtf/CMakeLists.txt
index a403345c50e19..2be4241815acd 100644
--- a/Source/WTF/wtf/CMakeLists.txt
+++ b/Source/WTF/wtf/CMakeLists.txt
@@ -46,7 +46,6 @@ set(WTF_PUBLIC_HEADERS
     ConcurrentPtrHashSet.h
     ConcurrentVector.h
     Condition.h
-    ConservativeScanStackGuards.h
     CountingLock.h
     CrossThreadCopier.h
     CrossThreadQueue.h
@@ -421,7 +420,6 @@ set(WTF_SOURCES
     CompilationThread.cpp
     ConcurrentBuffer.cpp
     ConcurrentPtrHashSet.cpp
-    ConservativeScanStackGuards.cpp
     CountingLock.cpp
     CrossThreadCopier.cpp
     CrossThreadTaskHandler.cpp
diff --git a/Source/WTF/wtf/ConservativeScanStackGuards.cpp b/Source/WTF/wtf/ConservativeScanStackGuards.cpp
deleted file mode 100644
index 7acf5ad146fdd..0000000000000
--- a/Source/WTF/wtf/ConservativeScanStackGuards.cpp
+++ /dev/null
@@ -1,6 +0,0 @@
-#include "ConservativeScanStackGuards.h"
-
-namespace WTF {
-    std::atomic_bool ConservativeScanStackGuards::active {true};
-    thread_local std::deque<void*>  ConservativeScanStackGuards::guard_ptr_stack;;
-}
\ No newline at end of file
diff --git a/Source/WTF/wtf/ConservativeScanStackGuards.h b/Source/WTF/wtf/ConservativeScanStackGuards.h
deleted file mode 100644
index 1216474ce0dfb..0000000000000
--- a/Source/WTF/wtf/ConservativeScanStackGuards.h
+++ /dev/null
@@ -1,65 +0,0 @@
-#pragma once
-
-#include "Logging.h"
-
-#include <atomic>
-#include <deque>
-
-namespace WTF {
-    class ConservativeScanStackGuards {
-        public:
-            struct ConservativeScanStackGuard {
-                ConservativeScanStackGuard() {
-                    ConservativeScanStackGuards::setStackGuard(this);
-                }
-                ~ConservativeScanStackGuard() {
-                    ConservativeScanStackGuards::resetStackGuard(this);
-                }
-
-                private:
-                    // Prevent heap allocation
-                    void *operator new   (size_t);
-                    void *operator new[] (size_t);
-                    void  operator delete   (void *);
-                    void  operator delete[] (void*);
-            };
-
-            friend struct ConservativeScanStackGuard;
-
-            static void* updatedStackOrigin(void *stackTop, void *stackOrigin) {
-                if (!active.load() || guard_ptr_stack.empty()) {
-                    return stackOrigin;
-                }
-
-                void *ret = stackOrigin;
-
-                void *guard_ptr = guard_ptr_stack.back();
-
-                if (guard_ptr > stackTop && guard_ptr < stackOrigin) {
-                    WTFLogAlways("ConservativeScanStackGuards: guard IN RANGE: stackTop: %p guard: %p stackOrigin: %p; correcting stackOrigin\n", stackTop, guard_ptr, stackOrigin);
-                    ret = guard_ptr;
-                }
-                return ret;
-            }
-
-            static void setActive(bool act) {
-                active.store(act);
-            }
-
-        private:
-
-            static thread_local std::deque<void*> guard_ptr_stack;
-            static std::atomic_bool active;
-
-            static void setStackGuard(void *ptr) {
-                guard_ptr_stack.push_back(ptr);
-            }
-
-            static void resetStackGuard(void *ptr) {
-                if (ptr != guard_ptr_stack.back()) {
-                    WTFLogAlways("ConservativeScanStackGuards::resetStackGuard expected %p, had: %p", guard_ptr_stack.back(), ptr);
-                }
-                guard_ptr_stack.pop_back();
-            }
-    };
-}
\ No newline at end of file
diff --git a/Source/WTF/wtf/glib/RunLoopGLib.cpp b/Source/WTF/wtf/glib/RunLoopGLib.cpp
index dc839b89d6273..027aa10964f12 100644
--- a/Source/WTF/wtf/glib/RunLoopGLib.cpp
+++ b/Source/WTF/wtf/glib/RunLoopGLib.cpp
@@ -31,8 +31,6 @@
 #include <wtf/MainThread.h>
 #include <wtf/glib/RunLoopSourcePriority.h>
 
-#include "wtf/ConservativeScanStackGuards.h"
-
 namespace WTF {
 
 typedef struct {
@@ -105,7 +103,6 @@ void RunLoop::run()
     ASSERT(!runLoop.m_mainLoops.isEmpty());
 
     GMainLoop* innermostLoop = runLoop.m_mainLoops[0].get();
-    ConservativeScanStackGuards::ConservativeScanStackGuard guard;
     if (!g_main_loop_is_running(innermostLoop)) {
         g_main_context_push_thread_default(mainContext);
         g_main_loop_run(innermostLoop);
diff --git a/Source/WebKit/WebProcess/WebProcess.cpp b/Source/WebKit/WebProcess/WebProcess.cpp
index da235c776cc44..c045c461b479e 100644
--- a/Source/WebKit/WebProcess/WebProcess.cpp
+++ b/Source/WebKit/WebProcess/WebProcess.cpp
@@ -1042,10 +1042,6 @@ void WebProcess::isJITEnabled(CompletionHandler<void(bool)>&& completionHandler)
 
 void WebProcess::garbageCollectJavaScriptObjects()
 {
-    {
-        JSLockHolder lock(commonVM());
-        commonVM().shrinkFootprintWhenIdle();
-    }
     GCController::singleton().garbageCollectNow();
 }