Revert of Matrix convolution bounds fix; affectsTransparentBlack fixes.

src/effects/SkMatrixConvolutionImageFilter.cpp

Index: src/effects/SkMatrixConvolutionImageFilter.cpp
diff --git a/src/effects/SkMatrixConvolutionImageFilter.cpp b/src/effects/SkMatrixConvolutionImageFilter.cpp
index 7c5dd8368f439e528ca06691d3f9ff3bb9273ad0..e58eec10f4e25d99c2fff2a262b232ea9bbda72b 100644
--- a/src/effects/SkMatrixConvolutionImageFilter.cpp
+++ b/src/effects/SkMatrixConvolutionImageFilter.cpp
@@ -335,12 +335,6 @@
     return true;
 }
 
-bool SkMatrixConvolutionImageFilter::canComputeFastBounds() const {
-    // Because the kernel is applied in device-space, we have no idea what
-    // pixels it will affect in object-space.
-    return false;
-}
-
 #if SK_SUPPORT_GPU
 
 static GrTextureDomain::Mode convert_tilemodes(