Mac: Use CLANG_CXX_LANGUAGE_STANDARD instead of OTHER_CPLUSPLUSFLAGS for C++11.

No functionality change now that all bots are on Xcode 4, and it's a bit
shorter and cleaner, and fixes a TODO.

BUG=147515
R=mark@chromium.org

Review URL: https://codereview.chromium.org/23514023

git-svn-id: http://src.chromium.org/svn/trunk/src/build@220729 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -3865,6 +3865,12 @@
               'CC': '$(SOURCE_ROOT)/<(clang_dir)/clang',
               'LDPLUSPLUS': '$(SOURCE_ROOT)/<(clang_dir)/clang++',
 
+              # gnu++11 instead of c++11 is needed because some code uses
+              # typeof() (a GNU extension).
+              # TODO(thakis): Eventually switch this to c++11 instead of
+              # gnu++11 (once typeof can be removed, which is blocked on c++11
+              # being available everywhere).
+              'CLANG_CXX_LANGUAGE_STANDARD': 'gnu++11',  # -std=gnu++11
               # Don't use -Wc++0x-extensions, which Xcode 4 enables by default
               # when building with clang. This warning is triggered when the
               # override keyword is used via the OVERRIDE macro from
@@ -3902,16 +3908,6 @@
                 # http://crbug.com/255186
                 '-Wno-deprecated-register',
               ],
-              'OTHER_CPLUSPLUSFLAGS': [
-                # gnu++11 instead of c++11 is needed because some code uses
-                # typeof() (a GNU extension).
-                # TODO(thakis): Eventually switch this to c++11 instead of
-                # gnu++11 (once typeof can be removed, which is blocked on c++11
-                # being available everywhere).
-                # TODO(thakis): Use CLANG_CXX_LANGUAGE_STANDARD instead once all
-                # bots use xcode 4 -- http://crbug.com/147515).
-                '$(inherited)', '-std=gnu++11',
-              ],
             }],
             ['clang==1 and clang_use_chrome_plugins==1', {
               'OTHER_CFLAGS': [