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

src/images/SkImageDecoder_astc.cpp

Index: src/images/SkImageDecoder_astc.cpp
diff --git a/src/images/SkImageDecoder_astc.cpp b/src/images/SkImageDecoder_astc.cpp
index 96d28f8569654c01b7e20b19bd6c74ea06cf8529..64cdf43e5de7909145cff8deea260de55cee2b6f 100644
--- a/src/images/SkImageDecoder_astc.cpp
+++ b/src/images/SkImageDecoder_astc.cpp
@@ -19,12 +19,12 @@ class SkASTCImageDecoder : public SkImageDecoder {
 public:
     SkASTCImageDecoder() { }
 
-    virtual Format getFormat() const SK_OVERRIDE {
+    Format getFormat() const SK_OVERRIDE {
         return kASTC_Format;
     }
 
 protected:
-    virtual Result onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE;
+    Result onDecode(SkStream* stream, SkBitmap* bm, Mode) SK_OVERRIDE;
 
 private:
     typedef SkImageDecoder INHERITED;