Mojofy DidCommitProvisionalLoad.

Refactor FrameHostMsg_DidCommitProvisionalLoad from being a legacy IPC
message into a method on mojom::FrameHost, a frame-scoped,
Channel-associated interface. There is no change to functionality.

This is a reland of crrev.com/500294, now that the reentrancy issue in
GpuChannelHost::Send has been resolved by crrev.com/502124. TBR'ing
original reviewers.

[email protected],[email protected],[email protected]

Bug: 729021
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Ic5bd3e1a69c8d4b7a58ae843ccbfe0e6d6241db4
Reviewed-on: https://chromium-review.googlesource.com/667115
Commit-Queue: Balazs Engedy <[email protected]>
Reviewed-by: Balazs Engedy <[email protected]>
Cr-Commit-Position: refs/heads/master@{#502254}
30 files changed