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

bench/ImageDecodeBench.cpp

Index: bench/ImageDecodeBench.cpp
diff --git a/bench/ImageDecodeBench.cpp b/bench/ImageDecodeBench.cpp
index 3ce2fb0afedf1b833a545ef7d1b4348e338117ec..55dffe9b2e8c808889f0bc411a5f133f4ed01819 100644
--- a/bench/ImageDecodeBench.cpp
+++ b/bench/ImageDecodeBench.cpp
@@ -28,16 +28,16 @@ public:
         fName.append(SkOSPath::Basename(filename));
     }
 
-    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
+    bool isSuitableFor(Backend backend) SK_OVERRIDE {
         return backend == kNonRendering_Backend;
     }
 
 protected:
-    virtual const char* onGetName() SK_OVERRIDE {
+    const char* onGetName() SK_OVERRIDE {
         return fName.c_str();
     }
 
-    virtual void onPreDraw() SK_OVERRIDE {
+    void onPreDraw() SK_OVERRIDE {
         SkFILEStream fileStream(fFilename.c_str());
         fValid = fileStream.isValid() && fileStream.getLength() > 0;
         if (fValid) {
@@ -52,7 +52,7 @@ protected:
         }
     }
 
-    virtual void onDraw(const int loops, SkCanvas*) SK_OVERRIDE {
+    void onDraw(const int loops, SkCanvas*) SK_OVERRIDE {
 #ifdef SK_DEBUG
         if (!fValid) {
             SkDebugf("stream was invalid: %s\n", fName.c_str());