GitLab

This CL moves the usage of starting_site_instance_, site_url and expected_render_process_host_id
from NavigationHandleImpl to NavigationRequest.
With this, these functions were also moved:
NavigationHandleImpl::UpdateSiteURL
NavigationHandleImpl::SetExpectedProcess

A new function is introduced, NavigationRequest::ResetExpectedProcess
for refactoring.

Change-Id: I92fd557b05108b2bf6b786e6467311e67791ce7d
Bug: 916537
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1481322Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Arthur Hemery <ahemery@chromium.org>
Commit-Queue: Mohamed Abdelhalim <zetamoo@google.com>
Cr-Commit-Position: refs/heads/master@{#638122}