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

src/images/SkImageDecoder_libpng.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 "SkImageDecoder.h"
 #include "SkImageEncoder.h"
 #include "SkColor.h"
@@ skipping 60 matching lines @@
     png_structp                         fPng_ptr;
     png_infop                           fInfo_ptr;
     SkColorType                         fColorType;
 };
 
 class SkPNGImageDecoder : public SkImageDecoder {
 public:
     SkPNGImageDecoder() {
         fImageIndex = NULL;
     }
-    virtual Format getFormat() const SK_OVERRIDE {
+    Format getFormat() const SK_OVERRIDE {
         return kPNG_Format;
     }
 
     virtual ~SkPNGImageDecoder() {
         SkDELETE(fImageIndex);
     }
 
 protected:
 #ifdef SK_BUILD_FOR_ANDROID
-    virtual bool onBuildTileIndex(SkStreamRewindable *stream, int *width, int *height) SK_OVERRIDE;
-    virtual bool onDecodeSubset(SkBitmap* bitmap, const SkIRect& region) SK_OVERRIDE;
+    bool onBuildTileIndex(SkStreamRewindable *stream, int *width, int *height) SK_OVERRIDE;
+    bool onDecodeSubset(SkBitmap* bitmap, const SkIRect& region) SK_OVERRIDE;
 #endif
-    virtual Result onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE;
+    Result onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE;
 
 private:
     SkPNGImageIndex* fImageIndex;
 
     bool onDecodeInit(SkStream* stream, png_structp *png_ptrp, png_infop *info_ptrp);
     bool decodePalette(png_structp png_ptr, png_infop info_ptr,
                        bool * SK_RESTRICT hasAlphap, bool *reallyHasAlphap,
                        SkColorTable **colorTablep);
     bool getBitmapColorType(png_structp, png_infop, SkColorType*, bool* hasAlpha,
                             SkPMColor* theTranspColor);
@@ skipping 978 matching lines @@
         SkPMColor c = *colors++;
         palette[i].red = SkGetPackedR32(c);
         palette[i].green = SkGetPackedG32(c);
         palette[i].blue = SkGetPackedB32(c);
     }
     return num_trans;
 }
 
 class SkPNGImageEncoder : public SkImageEncoder {
 protected:
-    virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) SK_OVERRIDE;
+    bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) SK_OVERRIDE;
 private:
     bool doEncode(SkWStream* stream, const SkBitmap& bm,
                   const bool& hasAlpha, int colorType,
                   int bitDepth, SkColorType ct,
                   png_color_8& sig_bit);
 
     typedef SkImageEncoder INHERITED;
 };
 
 bool SkPNGImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bitmap, int /*quality*/) {
@@ skipping 165 matching lines @@
     return SkImageDecoder::kUnknown_Format;
 }
 
 SkImageEncoder* sk_libpng_efactory(SkImageEncoder::Type t) {
     return (SkImageEncoder::kPNG_Type == t) ? SkNEW(SkPNGImageEncoder) : NULL;
 }
 
 static SkImageDecoder_DecodeReg gDReg(sk_libpng_dfactory);
 static SkImageDecoder_FormatReg gFormatReg(get_format_png);
 static SkImageEncoder_EncodeReg gEReg(sk_libpng_efactory);