cc: Rename ImageDecodeController to ImageDecodeCache.

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index edfd5b0aeeea09e74d7d92ef3d91362070fd3ba4..3a475e110ff5bec9e56315a035f3a5a68f113d6e 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -1281,8 +1281,8 @@ TileManager* LayerTreeImpl::tile_manager() const {
   return layer_tree_host_impl_->tile_manager();
 }
 
-ImageDecodeController* LayerTreeImpl::image_decode_controller() const {
-  return layer_tree_host_impl_->image_decode_controller();
+ImageDecodeCache* LayerTreeImpl::image_decode_cache() const {
+  return layer_tree_host_impl_->image_decode_cache();
 }
 
 FrameRateCounter* LayerTreeImpl::frame_rate_counter() const {