Failure is DevToolsProtocolTest.CrossSiteNavigation

Suspecting https://chromium-review.googlesource.com/c/585653/

Revert up in https://chromium-review.googlesource.com/c/590509

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/23f4680286ad33ed59f24303954ff5ab79ae6cf8

commit 23f4680286ad33ed59f24303954ff5ab79ae6cf8
Author: meade_UTC10 <meade@chromium.org>
Date: Fri Jul 28 01:47:03 2017

Revert "[DevTools] Suspend Page.navigate command until navigation has finished"

This reverts commit 40d4ce0e6ae34044b4c8a13b571d2454b187ac05.

Reason for revert: Seems to break browser_side_navigation_content_browsertests
on at least two mac builders (see  http://crbug.com/749915 )

Original change's description:
> [DevTools] Suspend Page.navigate command until navigation has finished
> 
> With browser side navigation, WCO::DidStartNavigation does not happen
> synchronously after calling NavigationController::LoadURL(), which makes
> Page.navigate command to be dispatched to old renderer during cross-process
> navigations and yields a stale frame id.
> 
> This patch specifically works around the problem for Page.navigate
> by calling back synchronously to RFDTAH.
> 
> BUG= 747224 
> 
> Change-Id: I44935a407a4223004ef9873a49fc18dabbbfe02a
> Reviewed-on: https://chromium-review.googlesource.com/585653
> Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
> Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#490096}

TBR=dgozman@chromium.org,pfeldman@chromium.org

Change-Id: Idad579478dd29cb59d35b688f4ad9b64628ec5fe
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  747224 , 749915 
Reviewed-on: https://chromium-review.googlesource.com/590509
Reviewed-by: meade_UTC10 <meade@chromium.org>
Commit-Queue: meade_UTC10 <meade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490191}
[modify] https://crrev.com/23f4680286ad33ed59f24303954ff5ab79ae6cf8/content/browser/devtools/protocol/devtools_protocol_browsertest.cc
[modify] https://crrev.com/23f4680286ad33ed59f24303954ff5ab79ae6cf8/content/browser/devtools/render_frame_devtools_agent_host.cc
[modify] https://crrev.com/23f4680286ad33ed59f24303954ff5ab79ae6cf8/content/browser/devtools/render_frame_devtools_agent_host.h

Revert has landed.

Seems to have cycled green after revert, closing this.