Roll chromium_revision 228675:229708

This will pick up the -Wunused-const-variable
Clang warning being enabled by default (chromium:307668).

BUG=none
TEST=trybots passing.
R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2629004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5014 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/build/common.gypi

@@ -311,14 +311,6 @@
            }],
          ],
       }],
-      ['clang==1', {
-        # TODO(kjellander): Remove when Chromium's common.gypi enables this
-        # warning by default (http://crbug.com/307668).
-        'cflags!': ['-Wno-unused-const-variable',],
-        'xcode_settings': {
-          'WARNING_CFLAGS!': ['-Wno-unused-const-variable',],
-        },
-      }],
     ], # conditions
     'direct_dependent_settings': {
       'include_dirs': [