Replace uses of GR_DEBUG by SK_DEBUG.

BUG=None
R=bsalomon@google.com, robertphillips@google.com

Author: tfarina@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23137022

git-svn-id: http://skia.googlecode.com/svn/trunk@10978 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrAARectRenderer.cpp b/src/gpu/GrAARectRenderer.cpp
index 3f26880..2e86fb70 100644
--- a/src/gpu/GrAARectRenderer.cpp
+++ b/src/gpu/GrAARectRenderer.cpp
@@ -363,7 +363,7 @@
         fAAStrokeRectIndexBuffer =
                   gpu->createIndexBuffer(sizeof(gStrokeAARectIdx), false);
         if (NULL != fAAStrokeRectIndexBuffer) {
-#if GR_DEBUG
+#ifdef SK_DEBUG
             bool updated =
 #endif
             fAAStrokeRectIndexBuffer->updateData(gStrokeAARectIdx,