Fix up all the easy virtual ... SK_OVERRIDE cases.

gm/matrixconvolution.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkColor.h"
 #include "SkMatrixConvolutionImageFilter.h"
 #include "SkGradientShader.h"
 
 namespace skiagm {
 
 class MatrixConvolutionGM : public GM {
 public:
     MatrixConvolutionGM() : fInitialized(false) {
         this->setBGColor(0x00000000);
     }
 
 protected:
-    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+    uint32_t onGetFlags() const SK_OVERRIDE {
         return kSkipTiled_Flag;
     }
 
     virtual SkString onShortName() {
         return SkString("matrixconvolution");
     }
 
     void make_bitmap() {
         fBitmap.allocN32Pixels(80, 80);
         SkCanvas canvas(fBitmap);
@@ skipping 78 matching lines @@
     SkBitmap fBitmap;
     bool fInitialized;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new MatrixConvolutionGM; }
 static GMRegistry reg(MyFactory);
 
 }