Rename LayerTreeView methods

This CL renames WillCloseLayerTreeView to WillCloseAnimationHost and
LayerTreeViewInitialized to AnimationHostInitialized. This CL removes
the WebLayerTreeView* parameter, which was unused.

Change-Id: I6edcb408cc2dab163345867017c579c0c4c437bc
Bug: 994936
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758836
Commit-Queue: Erik Chen <erikchen@chromium.org>
Auto-Submit: Erik Chen <erikchen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687906}
9 files changed