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

src/gpu/gl/SkNullGLContext.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkNullGLContext_DEFINED
 #define SkNullGLContext_DEFINED
 
 #include "gl/SkGLContext.h"
 
 class SK_API SkNullGLContext : public SkGLContext {
 public:
-    virtual ~SkNullGLContext() SK_OVERRIDE;
-    virtual void makeCurrent() const SK_OVERRIDE {};
-    virtual void swapBuffers() const SK_OVERRIDE {};
+    ~SkNullGLContext() SK_OVERRIDE;
+    void makeCurrent() const SK_OVERRIDE {};
+    void swapBuffers() const SK_OVERRIDE {};
 
     static SkNullGLContext* Create(GrGLStandard forcedGpuAPI) {
         if (kGLES_GrGLStandard == forcedGpuAPI) {
             return NULL;
         }
         SkNullGLContext* ctx = SkNEW(SkNullGLContext);
         if (!ctx->isValid()) {
             SkDELETE(ctx);
             return NULL;
         }
         return ctx;
     }
 
 private:
     SkNullGLContext();
 };
 
 #endif