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

src/images/SkScaledBitmapSampler.cpp

Index: src/images/SkScaledBitmapSampler.cpp
diff --git a/src/images/SkScaledBitmapSampler.cpp b/src/images/SkScaledBitmapSampler.cpp
index 8bb1bde7c41928d6eeaaff1b534c08624b5e779c..123b85f56a860e27f0acaefbe51ea35f890b0fb0 100644
--- a/src/images/SkScaledBitmapSampler.cpp
+++ b/src/images/SkScaledBitmapSampler.cpp
@@ -834,7 +834,7 @@ class DummyDecoder : public SkImageDecoder {
 public:
     DummyDecoder() {}
 protected:
-    virtual Result onDecode(SkStream*, SkBitmap*, SkImageDecoder::Mode) SK_OVERRIDE {
+    Result onDecode(SkStream*, SkBitmap*, SkImageDecoder::Mode) SK_OVERRIDE {
         return kFailure;
     }
 };