Replace uses of GR_API by SK_API.

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
   ],
   'conditions' : [
     [ 'skia_gpu == 1',
       {
         'defines': [
@@ skipping 211 matching lines @@
           # suppressions below here were added for clang
           '-Wno-unused-parameter',
           '-Wno-c++11-extensions'
         ],
         'conditions' : [
           [ 'skia_shared_lib', {
             'cflags': [
               '-fPIC',
             ],
             'defines': [
-              'GR_DLL=1',
-              'GR_IMPLEMENTATION=1',
               'SKIA_DLL',
               'SKIA_IMPLEMENTATION=1',
             ],
           }],
           [ 'skia_os == "nacl"', {
             'defines': [
               'SK_BUILD_FOR_NACL',
             ],
             'link_settings': {
               'libraries': [
@@ skipping 203 matching lines @@
         ],
         'cflags_cc': [
           '-fno-rtti',
         ],
         'conditions': [
           [ 'skia_shared_lib', {
             'cflags': [
               '-fPIC',
             ],
             'defines': [
-              'GR_DLL=1',
-              'GR_IMPLEMENTATION=1',
               'SKIA_DLL',
               'SKIA_IMPLEMENTATION=1',
             ],
           }],
           [ 'skia_profile_enabled == 1', {
             'cflags': ['-g', '-fno-omit-frame-pointer', '-marm', '-mapcs'],
           }],
         ],
       },
     ],
@@ skipping 10 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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