Update NDK to r27.

Differential Revision: https://phabricator.services.mozilla.com/D216899

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1893001
gecko-commit: b728c1e1493972dd0cd79df0c3e076cda7fc82fa
gecko-reviewers: geckoview-reviewers, calu

tools/wpt/android.py

@@ -16,8 +16,6 @@
 here = os.path.abspath(os.path.dirname(__file__))
 wpt_root = os.path.abspath(os.path.join(here, os.pardir, os.pardir))
 
-
-NDK_VERSION = "r26c"
 CMDLINE_TOOLS_VERSION_STRING = "12.0"
 CMDLINE_TOOLS_VERSION = "11076708"