clang: Turn on C++11 on CrOs too.

This was blocked on the main waterfall linux_chromeos_clang bot migrating
to precise, which has happened now.

I believe all bots that build chromeos with clang are on precise now. If any
turns red, this CL should be reverted.

BUG=none
R=ajwong@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=198920

Review URL: https://codereview.chromium.org/14992005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@203221 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -3064,7 +3064,7 @@
               '-mfpmath=sse',
             ],
           }],
-          ['clang==1 and (OS!="android" and chromeos!=1)', {
+          ['clang==1 and OS!="android"', {
             # Turn on C++11.
             'cflags': [
               # This warns on using ints as initializers for floats in
@@ -3085,7 +3085,7 @@
               '-std=gnu++11',
             ],
           }],
-          ['clang==1 and (OS=="android" or chromeos==1)', {
+          ['clang==1 and OS=="android"', {
             # Android uses gcc4.4, and clang isn't compatible with gcc4.4's
             # libstdc++ in C++11 mode. So no C++11 mode for Android yet.
             # Doesn't work with asan for some reason either: crbug.com/233464