Update from chromium https://crrev.com/304586

cc/test/fake_picture_layer_tiling_client.cc

Index: cc/test/fake_picture_layer_tiling_client.cc
diff --git a/cc/test/fake_picture_layer_tiling_client.cc b/cc/test/fake_picture_layer_tiling_client.cc
index a218a212e8496f40a5f0e0bfd446eb994f27dd53..b21e01183c632d76fff76316436d5a95b4de2fa1 100644
--- a/cc/test/fake_picture_layer_tiling_client.cc
+++ b/cc/test/fake_picture_layer_tiling_client.cc
@@ -49,10 +49,6 @@ scoped_refptr<Tile> FakePictureLayerTilingClient::CreateTile(
   return tile_manager_->CreateTile(pile_.get(), tile_size_, rect, 1, 0, 0, 0);
 }
 
-RasterSource* FakePictureLayerTilingClient::GetRasterSource() {
-  return pile_.get();
-}
-
 void FakePictureLayerTilingClient::SetTileSize(const gfx::Size& tile_size) {
   tile_size_ = tile_size;
 }