Update more directories under src/ to follow C++11 style rule for {virtual,override}.

src/images/SkImageDecoder_libjpeg.cpp

 /*
  * Copyright 2007 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"
@@ skipping 224 matching lines @@
     Format getFormat() const override {
         return kJPEG_Format;
     }
 
 protected:
 #ifdef SK_BUILD_FOR_ANDROID
     bool onBuildTileIndex(SkStreamRewindable *stream, int *width, int *height) override;
     bool onDecodeSubset(SkBitmap* bitmap, const SkIRect& rect) override;
 #endif
     Result onDecode(SkStream* stream, SkBitmap* bm, Mode) override;
-    virtual bool onDecodeYUV8Planes(SkStream* stream, SkISize componentSizes[3],
-                                    void* planes[3], size_t rowBytes[3],
-                                    SkYUVColorSpace* colorSpace) override;
+    bool onDecodeYUV8Planes(SkStream* stream, SkISize componentSizes[3],
+                            void* planes[3], size_t rowBytes[3],
+                            SkYUVColorSpace* colorSpace) override;
 
 private:
 #ifdef SK_BUILD_FOR_ANDROID
     SkJPEGImageIndex* fImageIndex;
     int fImageWidth;
     int fImageHeight;
 #endif
 
     /**
      *  Determine the appropriate bitmap colortype and out_color_space based on
@@ skipping 1208 matching lines @@
     return SkImageDecoder::kUnknown_Format;
 }
 
 static SkImageEncoder* sk_libjpeg_efactory(SkImageEncoder::Type t) {
     return (SkImageEncoder::kJPEG_Type == t) ? SkNEW(SkJPEGImageEncoder) : NULL;
 }
 
 static SkImageDecoder_DecodeReg gDReg(sk_libjpeg_dfactory);
 static SkImageDecoder_FormatReg gFormatReg(get_format_jpeg);
 static SkImageEncoder_EncodeReg gEReg(sk_libjpeg_efactory);