cc: Simplify the logic for deciding to update tile priorities.

cc/resources/picture_layer_tiling_set.cc

Index: cc/resources/picture_layer_tiling_set.cc
diff --git a/cc/resources/picture_layer_tiling_set.cc b/cc/resources/picture_layer_tiling_set.cc
index cc15047acf08f29bbd0f92e2ad2c2dc14e485175..fd978a731923a573e9e5f819c9d795923dafd513 100644
--- a/cc/resources/picture_layer_tiling_set.cc
+++ b/cc/resources/picture_layer_tiling_set.cc
@@ -286,7 +286,6 @@ void PictureLayerTilingSet::UpdateTilePriorities(
     float current_layer_contents_scale,
     const gfx::Transform& last_screen_transform,
     const gfx::Transform& current_screen_transform,
-    int current_source_frame_number,
     double current_frame_time,
     bool store_screen_space_quads_on_tiles,
     size_t max_tiles_for_interest_area) {
@@ -309,7 +308,6 @@ void PictureLayerTilingSet::UpdateTilePriorities(
         current_layer_contents_scale,
         last_screen_transform,
         current_screen_transform,
-        current_source_frame_number,
         current_frame_time,
         store_screen_space_quads_on_tiles,
         max_tiles_for_interest_area);