Change clear() to respect the clip

include/core/SkBitmapDevice.h

Index: include/core/SkBitmapDevice.h
diff --git a/include/core/SkBitmapDevice.h b/include/core/SkBitmapDevice.h
index dff5e65bc8852cbb50ca3e195a1e3d502df30cc7..03fd014d45addd5845d4d7827454726a67a3331b 100644
--- a/include/core/SkBitmapDevice.h
+++ b/include/core/SkBitmapDevice.h
@@ -40,11 +40,6 @@ public:
 protected:
     bool onShouldDisableLCD(const SkPaint&) const SK_OVERRIDE;
 
-    /** Clears the entire device to the specified color (including alpha).
-     *  Ignores the clip.
-     */
-    virtual void clear(SkColor color) SK_OVERRIDE;
-
     /** 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