Replace the internal '-mllvm -tsan-blacklist' flag with the user-visible -fsanitize-blacklist.

NOTRY=true
TBR=earthdok@chromium.org
BUG=

Review URL: https://codereview.chromium.org/254773004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266312 0039d316-1c4b-4281-b951-d872f2087c98

build/common.gypi

@@ -3712,7 +3712,7 @@
                 'cflags': [
                   '-fsanitize=thread',
                   '-fPIC',
-                  '-mllvm', '-tsan-blacklist=<(tsan_blacklist)',
+                  '-fsanitize-blacklist=<(tsan_blacklist)',
                 ],
                 'ldflags': [
                   '-fsanitize=thread',