Fix up flags to SkGpuBlurUtils::GaussianBlur

include/core/SkMaskFilter.h

Index: include/core/SkMaskFilter.h
diff --git a/include/core/SkMaskFilter.h b/include/core/SkMaskFilter.h
index fbd749e837f856115fe4682daad657df1aeb8db6..908226c8adf2444d99c6a54b7b2783acdb804bbc 100644
--- a/include/core/SkMaskFilter.h
+++ b/include/core/SkMaskFilter.h
@@ -133,16 +133,14 @@ public:
     /**
      * This function is used to implement filters that require an explicit src mask. It should only
      * be called if canFilterMaskGPU returned true and the maskRect param should be the output from
-     * that call. canOverwriteSrc indicates whether the implementation may treat src as a scratch
-     * texture and overwrite its contents. When true it is also legal to return src as the result.
+     * that call.
      * Implementations are free to get the GrContext from the src texture in order to create
      * additional textures and perform multiple passes.
      */
     virtual bool filterMaskGPU(GrTexture* src,
                                const SkMatrix& ctm,
                                const SkIRect& maskRect,
-                               GrTexture** result,
-                               bool canOverwriteSrc) const;
+                               GrTexture** result) const;
 #endif
 
     /**