Revert 166365 - roll clang 165787:167488

build/common.gypi

Index: build/common.gypi
===================================================================
--- build/common.gypi	(revision 166368)
+++ build/common.gypi	(working copy)
@@ -2592,8 +2592,6 @@
                 'cflags': [
                   '-faddress-sanitizer',
                   '-fno-omit-frame-pointer',
-                  # See http://crbug.com/159580
-                  '-w',
                 ],
                 'ldflags': [
                   '-faddress-sanitizer',
@@ -2612,8 +2610,6 @@
                   '-fno-omit-frame-pointer',
                   '-fPIE',
                   '-mllvm', '-tsan-blacklist=<(tsan_blacklist)'
-                  # See http://crbug.com/159580
-                  '-w',
                 ],
                 'ldflags': [
                   '-fthread-sanitizer',
@@ -3014,8 +3010,6 @@
               # binaries on x86_64 host is problematic.
               # TODO(eugenis): re-enable.
               '-faddress-sanitizer',
-              # See http://crbug.com/159580
-              '-w',
             ],
             'ldflags!': [
               '-faddress-sanitizer',
@@ -3135,8 +3129,6 @@
             'xcode_settings': {
               'OTHER_CFLAGS': [
                 '-faddress-sanitizer',
-                # See http://crbug.com/159580
-                '-w',
               ],
             },
             'defines': [