skia: Remove obsolete GR_* defines.

These were removed from skia and aren't used here in Chromium, so lets remove
them now.

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/23548012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221681 0039d316-1c4b-4281-b951-d872f2087c98

skia/skia.gyp

@@ -65,14 +65,11 @@
           ],
           'defines': [
             'SKIA_DLL',
-            'GR_DLL=1',
-            'GR_IMPLEMENTATION=1',
             'SKIA_IMPLEMENTATION=1',
           ],
           'direct_dependent_settings': {
             'defines': [
               'SKIA_DLL',
-              'GR_DLL=1',
             ],
           },
         },
@@ -87,7 +84,7 @@
       ],
     }],
   ],
-  
+
   # targets that are not dependent upon the component type
   'targets': [
     {