remove device::clear -- no longer called

include/device/xps/SkXPSDevice.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 SkXPSDevice_DEFINED
 #define SkXPSDevice_DEFINED
 
@@ skipping 52 matching lines @@
         const SkSize& trimSize,
         const SkRect* mediaBox = NULL,
         const SkRect* bleedBox = NULL,
         const SkRect* artBox = NULL,
         const SkRect* cropBox = NULL);
 
     virtual bool endSheet();
     virtual bool endPortfolio();
 
 protected:
-    virtual void clear(SkColor color) SK_OVERRIDE;
-
     virtual void drawPaint(const SkDraw&, const SkPaint& paint) SK_OVERRIDE;
 
     virtual void drawPoints(
         const SkDraw&,
         SkCanvas::PointMode mode,
         size_t count, const SkPoint[],
         const SkPaint& paint) SK_OVERRIDE;
 
     virtual void drawRect(
         const SkDraw&,
@@ skipping 237 matching lines @@
     virtual SkBaseDevice* onCreateCompatibleDevice(const CreateInfo&) SK_OVERRIDE;
 
     // Disable the default copy and assign implementation.
     SkXPSDevice(const SkXPSDevice&);
     void operator=(const SkXPSDevice&);
 
     typedef SkBitmapDevice INHERITED;
 };
 
 #endif