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

src/images/SkImageDecoder_libwebp.cpp

Index: src/images/SkImageDecoder_libwebp.cpp
diff --git a/src/images/SkImageDecoder_libwebp.cpp b/src/images/SkImageDecoder_libwebp.cpp
index d5caf702eeaf136a2d7357bcf9590bb0b04f87be..c56933dd2a6c015b366908f0240fae31dc0677bd 100644
--- a/src/images/SkImageDecoder_libwebp.cpp
+++ b/src/images/SkImageDecoder_libwebp.cpp
@@ -104,14 +104,14 @@ public:
         SkSafeUnref(fInputStream);
     }
 
-    virtual Format getFormat() const SK_OVERRIDE {
+    Format getFormat() const SK_OVERRIDE {
         return kWEBP_Format;
     }
 
 protected:
-    virtual bool onBuildTileIndex(SkStreamRewindable *stream, int *width, int *height) SK_OVERRIDE;
-    virtual bool onDecodeSubset(SkBitmap* bitmap, const SkIRect& rect) SK_OVERRIDE;
-    virtual Result onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE;
+    bool onBuildTileIndex(SkStreamRewindable *stream, int *width, int *height) SK_OVERRIDE;
+    bool onDecodeSubset(SkBitmap* bitmap, const SkIRect& rect) SK_OVERRIDE;
+    Result onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE;
 
 private:
     /**
@@ -588,7 +588,7 @@ static int stream_writer(const uint8_t* data, size_t data_size,
 
 class SkWEBPImageEncoder : 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:
     typedef SkImageEncoder INHERITED;