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

src/gpu/GrDrawTarget.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawTarget_DEFINED
 #define GrDrawTarget_DEFINED
 
@@ skipping 819 matching lines @@
      * ClipTarget subclass sets clip bit in the stencil buffer. The subclass
      * is free to clear the remaining bits to zero if masked clears are more
      * expensive than clearing all bits.
      */
     virtual void clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* = NULL) = 0;
 
     /**
      * Release any resources that are cached but not currently in use. This
      * is intended to give an application some recourse when resources are low.
      */
-    virtual void purgeResources() SK_OVERRIDE {
+    void purgeResources() SK_OVERRIDE {
         // The clip mask manager can rebuild all its clip masks so just
         // get rid of them all.
         fClipMaskManager.purgeResources();
     };
 
 protected:
     GrClipMaskManager           fClipMaskManager;
 
 private:
     GrClipMaskManager* clipMaskManager() SK_OVERRIDE { return &fClipMaskManager; }
 
     virtual bool setupClip(GrDrawState*,
                            GrDrawState::AutoRestoreEffects* are,
                            GrDrawState::AutoRestoreStencil* ars,
                            GrScissorState* scissorState,
                            const SkRect* devBounds) SK_OVERRIDE;
 
     typedef GrDrawTarget INHERITED;
 };
 
 #endif