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/GrGLTexture.h b/src/gpu/gl/GrGLTexture.h
index e41ebc8..62052fd 100644
--- a/src/gpu/gl/GrGLTexture.h
+++ b/src/gpu/gl/GrGLTexture.h
@@ -15,7 +15,7 @@
 /**
  * A ref counted tex id that deletes the texture in its destructor.
  */
-class GrGLTexID : public GrRefCnt {
+class GrGLTexID : public SkRefCnt {
 public:
     SK_DECLARE_INST_COUNT(GrGLTexID)
 
@@ -39,7 +39,7 @@
     GrGLuint             fTexID;
     bool                 fIsWrapped;
 
-    typedef GrRefCnt INHERITED;
+    typedef SkRefCnt INHERITED;
 };
 
 ////////////////////////////////////////////////////////////////////////////////