Revert "Change clear() to respect the clip"

include/core/SkDevice.h

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDevice_DEFINED
 #define SkDevice_DEFINED
 
@@ skipping 145 matching lines @@
      *  that want to parse it, but is not required: the region is a complete
      *  picture of the current clip. (i.e. if you regionize all of the geometry
      *  in the clipstack, you will arrive at an equivalent region to the one
      *  passed in).
      */
      virtual void setMatrixClip(const SkMatrix&, const SkRegion&,
                                 const SkClipStack&) {};
 
     /** Clears the entire device to the specified color (including alpha).
      *  Ignores the clip.
-     *  DEPRECATED : will go away when chrome subclasses have been updated
      */
-    virtual void clear(SkColor color);
+    virtual void clear(SkColor color) = 0;
 
     SK_ATTR_DEPRECATED("use clear() instead")
     void eraseColor(SkColor eraseColor) { this->clear(eraseColor); }
 
     /** These are called inside the per-device-layer loop for each draw call.
      When these are called, we have already applied any saveLayer operations,
      and are handling any looping from the paint, and any effects from the
      DrawFilter.
      */
     virtual void drawPaint(const SkDraw&, const SkPaint& paint) = 0;
@@ skipping 220 matching lines @@
     SkDeviceProperties* fLeakyProperties;   // will always exist.
 
 #ifdef SK_DEBUG
     bool        fAttachedToCanvas;
 #endif
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif