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

gm/astcbitmap.cpp

Index: gm/astcbitmap.cpp
diff --git a/gm/astcbitmap.cpp b/gm/astcbitmap.cpp
index b415a82a664bf6b815e736872b390b4c7180242f..808b23e3f2654e42762f72087640a5639e0d070a 100644
--- a/gm/astcbitmap.cpp
+++ b/gm/astcbitmap.cpp
@@ -53,15 +53,15 @@ public:
     virtual ~ASTCBitmapGM() { }
 
 protected:
-    virtual SkString onShortName() SK_OVERRIDE {
+    SkString onShortName() SK_OVERRIDE {
         return SkString("astcbitmap");
     }
 
-    virtual SkISize onISize() SK_OVERRIDE {
+    SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(kGMDimension, kGMDimension);
     }
 
-    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         for (int j = 0; j < 4; ++j) {
             for (int i = 0; i < 4; ++i) {
                 SkString filename = GetResourcePath(get_astc_filename(j*4+i));