Remove uses of GR_RELEASE.

Instead of using GR_RELEASE new code should just use SK_RELEASE, like its
counterpart SK_DEBUG instead of GR_DEBUG.

R=bsalomon@google.com, robertphillips@google.com

Author: tfarina@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23479017

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@11070 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/common.gypi b/common.gypi
index 4ab00f1..aaf741d 100644
--- a/common.gypi
+++ b/common.gypi
@@ -98,7 +98,6 @@
       'Release': {
         'defines': [
           'SK_RELEASE',
-          'GR_RELEASE=1',
         ],
       },
       'Release_Developer': {