Allow GTest to use C++11 features

testing/gtest.gyp

Index: testing/gtest.gyp
diff --git a/testing/gtest.gyp b/testing/gtest.gyp
index 79d7e669800e3a1614df0027537bc52c951a9b0d..0d2f3dd53490982a50013326d22099a39ea86050 100644
--- a/testing/gtest.gyp
+++ b/testing/gtest.gyp
@@ -25,16 +25,25 @@
         # In order to allow regex matches in gtest to be shared between Windows
         # and other systems, we tell gtest to always use it's internal engine.
         'GTEST_HAS_POSIX_RE=0',
-        # Chrome doesn't support / require C++11, yet.
-        'GTEST_LANG_CXX11=0',
       ],
       'all_dependent_settings': {
         'defines': [
           'GTEST_HAS_POSIX_RE=0',
-          'GTEST_LANG_CXX11=0',
         ],
       },
       'conditions': [
+        ['OS == "chromeos"', {
+          'defines': [
+              # ChromeOS uses libstd++4.6, which has an outdated <type_traits>
+              # header that lacks traits required by GTest in C++11 mode.
+              'GTEST_LANG_CXX11=0',
+          ],
+          'direct_dependency_settings': {
+            'defines': [
+                'GTEST_LANG_CXX11=0',
+            ],
+          },
+        }],
         ['OS == "mac" or OS == "ios"', {
           'sources': [
             'gtest_mac.h',