Revert of Build in C++11 mode on Unix-like bots.

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
     'SK_SUPPORT_GPU=<(skia_gpu)',
     'SK_SUPPORT_OPENCL=<(skia_opencl)',
     'SK_FORCE_DISTANCE_FIELD_TEXT=<(skia_force_distance_field_text)',
   ],
   'conditions' : [
@@ skipping 198 matching lines @@
           '-g',
           '-fno-exceptions',
           '-fstrict-aliasing',
 
           '-Wall',
           '-Wextra',
           '-Winit-self',
           '-Wpointer-arith',
           '-Wsign-compare',
 
+          '-Wno-c++11-extensions',
           '-Wno-unused-parameter',
         ],
         'cflags_cc': [
-          '-std=c++11',
           '-fno-rtti',
           '-Wnon-virtual-dtor',
           '-Wno-invalid-offsetof',  # GCC <4.6 is old-school strict about what is POD.
         ],
         'conditions': [
           [ 'skia_os != "chromeos"', {
             'conditions': [
               [ 'skia_arch_width == 64 and skia_arch_type == "x86"', {
                 'cflags': [
                   '-m64',
@@ skipping 239 matching lines @@
               [ 'skia_sanitizer == "thread"', {
                 'defines': [ 'DYNAMIC_ANNOTATIONS_ENABLED=1' ],
               }],
               [ 'skia_sanitizer == "undefined"', {
                 'cflags_cc!': ['-fno-rtti'],
               }],
             ],
           }],
           [ 'skia_clang_build', {
             'cflags_cc': [
+                # Build in C++11 mode to make sure we'll have an easy time switching.
+                '-std=c++11',
                 '-Wno-unknown-warning-option',  # Allows unknown warnings.
                 '-Wno-deprecated',              # From Qt, via debugger (older Clang).
                 '-Wno-deprecated-register',     # From Qt, via debugger (newer Clang).
             ],
             'cflags': [
                 # Extra warnings we like but that only Clang knows about.
                 '-Wstring-conversion',
             ],
             'cflags!': [
                 '-mfpmath=sse',  # Clang doesn't need to be told this, and sometimes gets confused.
@@ skipping 162 matching lines @@
     [ 'skia_is_bot', {
       'defines': [ 'SK_CRASH_HANDLER' ],
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }