change gpudevice and pdfdevice to inherit from basedevice

src/utils/SkGatherPixelRefsAndRects.h

Index: src/utils/SkGatherPixelRefsAndRects.h
diff --git a/src/utils/SkGatherPixelRefsAndRects.h b/src/utils/SkGatherPixelRefsAndRects.h
index df3651e2e526f02f5e87dde8dcb8a54c99c21f8e..5d980aaf5fd44080560899763a7fddb05ea4f2ec 100644
--- a/src/utils/SkGatherPixelRefsAndRects.h
+++ b/src/utils/SkGatherPixelRefsAndRects.h
@@ -39,12 +39,7 @@ public:
         return fEmptyBitmap.info();
     }
 
-    virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
-
 protected:
-    virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE {
-        return false;
-    }
     virtual void clear(SkColor color) SK_OVERRIDE {
         NothingToDo();
     }
@@ -319,8 +314,6 @@ private:
                           (info.width(), info.height(), fPRCont));
     }
 
-    virtual void flush() SK_OVERRIDE {}
-
     static void NotSupported() {
         SkDEBUGFAIL("this method should never be called");
     }