Update outdated comment.

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 3728 matching lines @@
                 '-Wno-unused-function',
 
                 # Warns on switches on enums that cover all enum values but
                 # also contain a default: branch. Chrome is full of that.
                 '-Wno-covered-switch-default',
 
                 # Warns when a const char[] is converted to bool.
                 '-Wstring-conversion',
               ],
               'OTHER_CPLUSPLUSFLAGS': [
-                # gnu++11 instead of c++11 so that __ANSI_C__ doesn't get
-                # defined.  (Else e.g. finite() in base/float_util.h needs to
-                # be isfinite() which doesn't exist on the android bots.)
-                # typeof() is also disabled in c++11 (but we could use

[danakj, 2013/05/09 00:02:24]

Oh, it mentioned typeof() here, but I see it's also in the TODO, okay.

-                # decltype() instead).
-                # TODO(thakis): Use CLANG_CXX_LANGUAGE_STANDARD instead once all
-                # bots use xcode 4 -- http://crbug.com/147515).
+                # 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',
               ],
             }],
             # TODO(thakis): Reenable plugins with once
             # tools/clang/scripts/update.sh no longer pins clang to an ancient
             # version for asan (http://crbug.com/170629)
             ['clang==1 and clang_use_chrome_plugins==1 and asan!=1', {
               'OTHER_CFLAGS': [
                 '<@(clang_chrome_plugins_flags)',
               ],
@@ skipping 689 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }