Remove unused function in PictureLayerTiling

cc/resources/picture_layer_tiling.h

Index: cc/resources/picture_layer_tiling.h
diff --git a/cc/resources/picture_layer_tiling.h b/cc/resources/picture_layer_tiling.h
index 538117cffa123f4b55049e94d741829e7d5a844d..feb40ff16fdf79e9857ea44860257913ffdc78e4 100644
--- a/cc/resources/picture_layer_tiling.h
+++ b/cc/resources/picture_layer_tiling.h
@@ -74,7 +74,7 @@ class CC_EXPORT PictureLayerTiling {
     bool TileNeedsRaster(Tile* tile) const {
       RasterMode mode = tile->DetermineRasterModeForTree(tree_);
       return tile->NeedsRasterForMode(mode);
-    };
+    }
 
     PictureLayerTiling* tiling_;
 
@@ -208,8 +208,6 @@ class CC_EXPORT PictureLayerTiling {
     friend class PictureLayerTiling;
   };
 
-  Region OpaqueRegionInContentRect(const gfx::Rect& content_rect) const;
-
   void Reset();
 
   void UpdateTilePriorities(WhichTree tree,