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/GrInOrderDrawBuffer.cpp b/src/gpu/GrInOrderDrawBuffer.cpp
index d04538d..1cd04d9 100644
--- a/src/gpu/GrInOrderDrawBuffer.cpp
+++ b/src/gpu/GrInOrderDrawBuffer.cpp
@@ -431,7 +431,7 @@
         // we always have a VB, but not always an IB
         SkASSERT(NULL != fDraws[d].fVertexBuffer);
         fDraws[d].fVertexBuffer->unref();
-        GrSafeUnref(fDraws[d].fIndexBuffer);
+        SkSafeUnref(fDraws[d].fIndexBuffer);
     }
     fCmds.reset();
     fDraws.reset();