style nit cleanups. e.g. remove 'virtual' on override declarations

include/effects/SkXfermodeImageFilter.h

 /*
  * Copyright 2013 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkXfermodeImageFilter_DEFINED
 #define SkXfermodeImageFilter_DEFINED
 
@@ skipping 15 matching lines @@
     static SkXfermodeImageFilter* Create(SkXfermode* mode, SkImageFilter* background,
                                          SkImageFilter* foreground = NULL,
                                          const CropRect* cropRect = NULL) {
         SkImageFilter* inputs[2] = { background, foreground };
         return SkNEW_ARGS(SkXfermodeImageFilter, (mode, inputs, cropRect));
     }
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkXfermodeImageFilter)
 
-    virtual bool onFilterImage(Proxy* proxy,
-                               const SkBitmap& src,
-                               const Context& ctx,
-                               SkBitmap* dst,
-                               SkIPoint* offset) const override;
+    bool onFilterImage(Proxy* proxy,
+                       const SkBitmap& src,
+                       const Context& ctx,
+                       SkBitmap* dst,
+                       SkIPoint* offset) const override;
 #if SK_SUPPORT_GPU
     bool canFilterImageGPU() const override;
-    virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
-                                SkBitmap* result, SkIPoint* offset) const override;
+    bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
+                        SkBitmap* result, SkIPoint* offset) const override;
 #endif
 
 protected:
     SkXfermodeImageFilter(SkXfermode* mode, SkImageFilter* inputs[2],
                           const CropRect* cropRect);
     void flatten(SkWriteBuffer&) const override;
 
 private:
     SkXfermode* fMode;
     typedef SkImageFilter INHERITED;
 };
 
 #endif