Drop unneeded warning suppression on mac

BUG=162783

Review URL: https://codereview.chromium.org/400873003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285578 0039d316-1c4b-4281-b951-d872f2087c98

build/common.gypi

@@ -3999,7 +3999,6 @@
               ['OS=="mac"', {
                 'cflags': [
                   '-mllvm -asan-globals=0',  # http://crbug.com/352073
-                  '-Wno-error=unused-function',  # http://crbug.com/162783
                 ],
               }],
             ],
@@ -4019,13 +4018,6 @@
                 ],
               }],
             ],
-            'conditions': [
-              ['OS=="mac"', {
-                'cflags': [
-                  '-Wno-error=unused-function',  # http://crbug.com/162783
-                ],
-              }],
-            ],
           }],
           ['ubsan_vptr==1', {
             'target_conditions': [
@@ -4048,13 +4040,6 @@
                 ],
               }],
             ],
-            'conditions': [
-              ['OS=="mac"', {
-                'cflags': [
-                  '-Wno-error=unused-function',  # http://crbug.com/162783
-                ],
-              }],
-            ],
           }],
           ['asan_coverage!=0', {
             'target_conditions': [
@@ -4638,13 +4623,6 @@
               '-Wl,--warn-shared-textrel',
               '-Wl,--fatal-warnings',
             ],
-            'conditions': [
-              ['OS=="mac"', {
-                'cflags!': [
-                  '-Wno-error=unused-function',  # http://crbug.com/162783
-                ],
-              }],
-            ],
           }],
           # Settings for building host targets on mac.
           ['_toolset=="host" and host_os=="mac"', {
@@ -4802,7 +4780,6 @@
               'OTHER_CFLAGS': [
                 '-fsanitize=address',
                 '-mllvm -asan-globals=0',  # http://crbug.com/352073
-                '-Wno-error=unused-function',  # http://crbug.com/162783
                 '-gline-tables-only',
               ],
             },