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

src/images/SkImageDecoder_libgif.cpp

 /*
  * Copyright 2006 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.
  */
 
 #include "SkColor.h"
 #include "SkColorPriv.h"
 #include "SkColorTable.h"
 #include "SkImageDecoder.h"
 #include "SkRTConf.h"
 #include "SkScaledBitmapSampler.h"
 #include "SkStream.h"
 #include "SkTemplates.h"
 #include "SkUtils.h"
 
 #include "gif_lib.h"
 
 class SkGIFImageDecoder : public SkImageDecoder {
 public:
-    virtual Format getFormat() const SK_OVERRIDE {
+    Format getFormat() const SK_OVERRIDE {
         return kGIF_Format;
     }
 
 protected:
-    virtual Result onDecode(SkStream* stream, SkBitmap* bm, Mode mode) SK_OVERRIDE;
+    Result onDecode(SkStream* stream, SkBitmap* bm, Mode mode) SK_OVERRIDE;
 
 private:
     typedef SkImageDecoder INHERITED;
 };
 
 static const uint8_t gStartingIterlaceYValue[] = {
     0, 4, 2, 1
 };
 static const uint8_t gDeltaIterlaceYValue[] = {
     8, 8, 4, 2
@@ skipping 483 matching lines @@
 static SkImageDecoder_DecodeReg gReg(sk_libgif_dfactory);
 
 static SkImageDecoder::Format get_format_gif(SkStreamRewindable* stream) {
     if (is_gif(stream)) {
         return SkImageDecoder::kGIF_Format;
     }
     return SkImageDecoder::kUnknown_Format;
 }
 
 static SkImageDecoder_FormatReg gFormatReg(get_format_gif);