Revert of [Page Load Metrics] PageLoadMetrics Mojofication.

Revert of [Page Load Metrics] PageLoadMetrics Mojofication. (patchset #19 id:520001 of https://codereview.chromium.org/2823523003/ )

Reason for revert:
Revert this patch due to windows crash and we are at the corner of branch day.

Original issue's description:
> [Page Load Metrics] PageLoadMetrics Mojofication.
> 
> This patch
> 
> 1. Adds mojo pipeline;
> 2. Adds Finch Trial check to toggle mojo IPC;
> 3. Modifies browser tests to be parameterized for mojo IPC.
> 
> The PageLoadMetrics mojo interface defines a UpdateTiming interface that is
> implemented by MetricsWebContentsObserver. PageLoadMetrics is sensitive to IPC
> ordering, thus MetricsWebContentsObserver holds a WebContentsFrameBindingSet
> that is used to bind associated interface together with RenderFrameHost, and it
> shares the legacy IPC channel so that we make sure we don't break IPC ordering.
> 
> BUG=709259, 712915
> 
> Review-Url: https://codereview.chromium.org/2823523003
> Cr-Commit-Position: refs/heads/master@{#473663}
> Committed: https://chromium.googlesource.com/chromium/src/+/a44af8f558766ab8c6b65fff8be4b1ef1a5f903b

TBR=bmcquade@chromium.org,rkaplow@chromium.org,rockot@chromium.org,tsepez@chromium.org,zhenw@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=709259, 712915

[lpy, 2017-05-24 05:49:54]

The CQ bit was checked by lpy@chromium.org

[lpy, 2017-05-24 05:49:55]

Created Revert of [Page Load Metrics] PageLoadMetrics Mojofication.

[lpy, 2017-05-24 05:50:12]

The CQ bit was unchecked by lpy@chromium.org

[lpy, 2017-05-24 05:50:18]

The CQ bit was checked by lpy@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-05-24 05:51:22]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-24 08:42:23]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-05-24 08:42:24]

Dry run: This issue passed the CQ dry run.

[Bryan McQuade, 2017-05-24 16:13:04]

On 2017/05/24 at 05:49:55, lpy wrote:
> Created Revert of [Page Load Metrics] PageLoadMetrics Mojofication.

let's turn off the field trial, instead of reverting the change.

[Bryan McQuade, 2017-05-24 17:20:05]

On 2017/05/24 at 16:13:04, Bryan McQuade wrote:
> On 2017/05/24 at 05:49:55, lpy wrote:
> > Created Revert of [Page Load Metrics] PageLoadMetrics Mojofication.
> 
> let's turn off the field trial, instead of reverting the change.

Field trial has been disabled, so there is no need to land this revert. I'll
close this out.

[lpy, 2017-05-24 17:20:28]

On 2017/05/24 17:20:05, Bryan McQuade wrote:
> On 2017/05/24 at 16:13:04, Bryan McQuade wrote:
> > On 2017/05/24 at 05:49:55, lpy wrote:
> > > Created Revert of [Page Load Metrics] PageLoadMetrics Mojofication.
> > 
> > let's turn off the field trial, instead of reverting the change.
> 
> Field trial has been disabled, so there is no need to land this revert. I'll
> close this out.

Thank you.