Allow C++11 in unittests.

BUG=v8:6072

Review-Url: https://codereview.chromium.org/2741573003
Cr-Commit-Position: refs/heads/master@{#43712}

test/cctest/test-utils.cc

@@ -275,16 +275,7 @@ TEST(CPlusPlus11Features) {
   S s{true, {3.1415, {1, 2, 3}}};
   CHECK_EQ(2, s.t.z[1]);
 
-// TODO(svenpanne) Remove the old-skool code when we ship the new C++ headers.
-#if 0
   std::vector<int> vec{11, 22, 33, 44};
-#else
-  std::vector<int> vec;
-  vec.push_back(11);
-  vec.push_back(22);
-  vec.push_back(33);
-  vec.push_back(44);
-#endif
   vec.push_back(55);
   vec.push_back(66);
   for (auto& i : vec) {

test/unittests/unittests.gyp

@@ -255,18 +255,6 @@
             '<(icu_gyp_path):icuuc',
           ],
         }],
-        ['os_posix == 1', {
-          # TODO(svenpanne): This is a temporary work-around to fix the warnings
-          # that show up because we use -std=gnu++0x instead of -std=c++11.
-          'cflags!': [
-            '-pedantic',
-          ],
-          'direct_dependent_settings': {
-            'cflags!': [
-              '-pedantic',
-            ],
-          },
-        }],
       ],
     },
   ],