Removed old resource locking system

https://codereview.appspot.com/6488098/



git-svn-id: http://skia.googlecode.com/svn/trunk@5453 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/SkGrPixelRef.cpp b/src/gpu/SkGrPixelRef.cpp
index bb36d32..e770ef0 100644
--- a/src/gpu/SkGrPixelRef.cpp
+++ b/src/gpu/SkGrPixelRef.cpp
@@ -110,7 +110,7 @@
         GrContext* context = fSurface->getContext();
         GrTexture* texture = fSurface->asTexture();
         if (NULL != context && NULL != texture) {
-            context->unlockTexture(texture);
+            context->unlockScratchTexture(texture);
         }
     }
     GrSafeUnref(fSurface);