Optimize CSS box-shadow performance

src/core/SkMaskFilter.cpp

Index: src/core/SkMaskFilter.cpp
diff --git a/src/core/SkMaskFilter.cpp b/src/core/SkMaskFilter.cpp
index a2adc7c327555d9054b24063b6e698e8c54d52e8..51259635ea4f0eeb7bff77d411530d580e24ae3d 100644
--- a/src/core/SkMaskFilter.cpp
+++ b/src/core/SkMaskFilter.cpp
@@ -219,7 +219,6 @@ bool SkMaskFilter::filterRRect(const SkRRect& devRRect, const SkMatrix& matrix,
         return false;
     }
     draw_nine(patch.fMask, patch.fOuterRect, patch.fCenter, true, clip, blitter);
-    SkMask::FreeImage(patch.fMask.fImage);
     return true;
 }
 
@@ -244,7 +243,6 @@ bool SkMaskFilter::filterPath(const SkPath& devPath, const SkMatrix& matrix,
             case kTrue_FilterReturn:
                 draw_nine(patch.fMask, patch.fOuterRect, patch.fCenter, 1 == rectCount, clip,
                           blitter);
-                SkMask::FreeImage(patch.fMask.fImage);
                 return true;
 
             case kUnimplemented_FilterReturn:
@@ -266,7 +264,6 @@ bool SkMaskFilter::filterPath(const SkPath& devPath, const SkMatrix& matrix,
     if (!this->filterMask(&dstM, srcM, matrix, NULL)) {
         return false;
     }
-    SkAutoMaskFreeImage autoDst(dstM.fImage);
 
     // if we get here, we need to (possibly) resolve the clip and blitter
     SkAAClipBlitterWrapper wrapper(clip, blitter);