Remove WebContents::GetRoutingID().
Replace all definitions, declarations, and uses of
WebContents::GetRoutingID() with
web_contents->GetRenderViewHost()->GetRoutingID().
This will make it more clear which routing id is being used.
Having GetRoutingID() on WebContents is both confusing (WebContents
isn't a routable object) and is prone to misuse with OOPIFs.
No behaviour changes should be caused by this CL.
BUG=
666525
Committed:
https://crrev.com/996be1115fde6db6ff18ed5b03278a6610a5eb38
Cr-Commit-Position: refs/heads/master@{#435182}