Revert of Change clear() to respect the clip

src/utils/SkPictureUtils.cpp

Index: src/utils/SkPictureUtils.cpp
diff --git a/src/utils/SkPictureUtils.cpp b/src/utils/SkPictureUtils.cpp
index 2c6b8f56b53db57b0f013bebae18dc142217c0f6..7f9409adacee65a3d5f574e9437a2a3757385fb5 100644
--- a/src/utils/SkPictureUtils.cpp
+++ b/src/utils/SkPictureUtils.cpp
@@ -77,6 +77,10 @@
         return false;
     }
 
+    virtual void clear(SkColor color) SK_OVERRIDE {
+        nothing_to_do();
+    }
+
     virtual void drawPaint(const SkDraw&, const SkPaint& paint) SK_OVERRIDE {
         this->addBitmapFromPaint(paint);
     }