Remove GrRefCnt.h in favor of SkRefCnt.h

This removes GrRefCnt.h with all its tyepdefs and #defines and just switch them
to the Sk* equivalents.

GrSafeSetNull was promoted to SkSafeSetNull in SkRefCnt.h.

BUG=None
TEST=none, no functional changes.
R=bsalomon@google.com, robertphillips@google.com

Author: tfarina@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23904003

git-svn-id: http://skia.googlecode.com/svn/trunk@11151 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrOvalRenderer.cpp b/src/gpu/GrOvalRenderer.cpp
index 79c8e83..4f41ae9 100644
--- a/src/gpu/GrOvalRenderer.cpp
+++ b/src/gpu/GrOvalRenderer.cpp
@@ -464,7 +464,7 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 void GrOvalRenderer::reset() {
-    GrSafeSetNull(fRRectIndexBuffer);
+    SkSafeSetNull(fRRectIndexBuffer);
 }
 
 bool GrOvalRenderer::drawOval(GrDrawTarget* target, const GrContext* context, bool useAA,