Move have_wheel_event_handlers to WebLayerTreeView.

Since having wheel event handlers was based on the document in general
there was no need for the hit testing code for determining the layer in
cc. So it makes more sense to have these fields on the layer tree view.

BUG=489802
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1639363002

Cr-Commit-Position: refs/heads/master@{#372346}
42 files changed