Revert Skia to use -02.

There was no clear speed improvement and the
increase in binary size was substantial.

Committed: http://code.google.com/p/skia/source/detail?r=8492

Review URL: https://codereview.chromium.org/13468010

git-svn-id: http://skia.googlecode.com/svn/trunk@8494 2bbb7eff-a529-9590-31e7-b0007b416f81

gyp/common_conditions.gypi

@@ -299,7 +299,7 @@
             'cflags': ['-g']
           },
           'Release': {
-            'cflags': ['-O2'],
+            'cflags': ['-O3'],
             'defines': [ 'NDEBUG' ],
           },
         },