Revert of No threadsafe statics.

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_DISTANCEFIELD_FONTS=<(skia_force_distancefield_fonts)',
   ],
   'conditions' : [
@@ skipping 184 matching lines @@
           '-Wall',
           '-Wextra',
           '-Winit-self',
           '-Wpointer-arith',
 
           '-Wno-c++11-extensions',
           '-Wno-unused-parameter',
         ],
         'cflags_cc': [
           '-fno-rtti',
-          '-fno-threadsafe-statics',  # Chrome disables this, so for safety we should too.
           '-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 416 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',
   },
 }