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

src/utils/SkEventTracer.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkEventTracer.h"
 #include "SkOnce.h"
 
 class SkDefaultEventTracer: public SkEventTracer {
     virtual SkEventTracer::Handle
         addTraceEvent(char phase,
                       const uint8_t* categoryEnabledFlag,
                       const char* name,
                       uint64_t id,
                       int numArgs,
                       const char** argNames,
                       const uint8_t* argTypes,
                       const uint64_t* argValues,
                       uint8_t flags) SK_OVERRIDE { return 0; }
 
     virtual void
         updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
                                  const char* name,
                                  SkEventTracer::Handle handle) SK_OVERRIDE {};
 
-    virtual const uint8_t* getCategoryGroupEnabled(const char* name) SK_OVERRIDE {
+    const uint8_t* getCategoryGroupEnabled(const char* name) SK_OVERRIDE {
         static uint8_t no = 0;
         return &no;
     };
     virtual const char* getCategoryGroupName(
       const uint8_t* categoryEnabledFlag) SK_OVERRIDE {
         static const char* dummy = "dummy";
         return dummy;
     };
 };
 
@@ skipping 11 matching lines @@
     atexit(cleanup_tracer);
 }
 
 
 SkEventTracer* SkEventTracer::GetInstance() {
     SK_DECLARE_STATIC_ONCE(once);
     SkOnce(&once, intialize_default_tracer, SkEventTracer::gInstance);
     SkASSERT(SkEventTracer::gInstance);
     return SkEventTracer::gInstance;
 }