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/gl/GrGLContext.cpp b/src/gpu/gl/GrGLContext.cpp
index 1d0a01f..93f3691 100644
--- a/src/gpu/gl/GrGLContext.cpp
+++ b/src/gpu/gl/GrGLContext.cpp
@@ -73,13 +73,13 @@
 }
 
 GrGLContext& GrGLContext::operator = (const GrGLContext& ctx) {
-    GrSafeAssign(fInterface, ctx.fInterface);
+    SkRefCnt_SafeAssign(fInterface, ctx.fInterface);
     fInfo = ctx.fInfo;
     return *this;
 }
 
 void GrGLContext::reset() {
-    GrSafeSetNull(fInterface);
+    SkSafeSetNull(fInterface);
     fInfo.reset();
 }