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

src/images/SkDecodingImageGenerator.cpp

Index: src/images/SkDecodingImageGenerator.cpp
diff --git a/src/images/SkDecodingImageGenerator.cpp b/src/images/SkDecodingImageGenerator.cpp
index d5c2ba88186eeb547595e52cb890a16a5ff6abf4..baa112c303d4cfa6b6303a9b8ea08259dc1b7038 100644
--- a/src/images/SkDecodingImageGenerator.cpp
+++ b/src/images/SkDecodingImageGenerator.cpp
@@ -37,8 +37,8 @@ public:
                            bool ditherImage);
 
 protected:
-    virtual SkData* onRefEncodedData() SK_OVERRIDE;
-    virtual bool onGetInfo(SkImageInfo* info) SK_OVERRIDE {
+    SkData* onRefEncodedData() SK_OVERRIDE;
+    bool onGetInfo(SkImageInfo* info) SK_OVERRIDE {
         *info = fInfo;
         return true;
     }