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

samplecode/SampleClock.cpp

Index: samplecode/SampleClock.cpp
diff --git a/samplecode/SampleClock.cpp b/samplecode/SampleClock.cpp
index 17ddc834aff82b120dd37c75945a779185c10981..651a995c8f9ca579c0733ac6ad594261e7ae85f1 100644
--- a/samplecode/SampleClock.cpp
+++ b/samplecode/SampleClock.cpp
@@ -22,7 +22,7 @@ public:
 
 protected:
     // overrides from SkEventSink
-    virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
+    bool onQuery(SkEvent* evt) SK_OVERRIDE {
         if (SampleCode::TitleQ(*evt)) {
             SampleCode::TitleR(evt, "Clock");
             return true;
@@ -30,7 +30,7 @@ protected:
         return this->INHERITED::onQuery(evt);
     }
 
-    virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
+    void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
         SkPaint paintFill;
         SkPaint paintStroke;
         SkPath  path;