Remove dead flush histograms code.

Remove dead flush histograms code.

In https://codereview.chromium.org/2437863005, page_load_histograms,
which was the only consumer of this code, was removed. Now that the
page_load_histograms code has been removed, this code can be removed as
well.

This change is also a follow up to https://codereview.chromium.org/2231843002,
which disabled histogram flushing when persistence was enabled. Now that
page_load_histograms is gone, we can remove the flushing logic entirely.

BUG=657993
Committed: https://crrev.com/d48284c61aefddb82c657751c59d4a32e5b4fd3c
Cr-Commit-Position: refs/heads/master@{#429346}

[Bryan McQuade, 2016-11-02 13:38:30]

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

[commit-bot: I haz the power, 2016-11-02 13:38:53]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Bryan McQuade, 2016-11-02 13:53:55]

Description was changed from

==========
Remove dead flush histograms code.

In https://codereview.chromium.org/2437863005, page_load_histograms,
which was the only consumer of this code, was removed. Now that the
page_load_histograms code has been removed, this code can be removed as
well.

BUG=657993
==========

to

==========
Remove dead flush histograms code.

In https://codereview.chromium.org/2437863005, page_load_histograms,
which was the only consumer of this code, was removed. Now that the
page_load_histograms code has been removed, this code can be removed as
well.

This change is also a follow up to https://codereview.chromium.org/2231843002,
which disabled histogram flushing when persistence was enabled. Now that
page_load_histograms is gone, we can remove the flushing logic entirely.

BUG=657993
==========

[Bryan McQuade, 2016-11-02 13:55:19]

bmcquade@chromium.org changed reviewers:
+ bcwhite@chromium.org

[Bryan McQuade, 2016-11-02 13:56:01]

bcwhite, PTAL - this removes the histogram flushing code used by
page_load_histograms in the render process entirely. I'll add a content/ owner
for review once you've had a look, thanks!

[commit-bot: I haz the power, 2016-11-02 14:34:38]

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

[commit-bot: I haz the power, 2016-11-02 14:34:39]

Dry run: This issue passed the CQ dry run.

[bcwhite, 2016-11-02 17:51:06]

lgtm

[Bryan McQuade, 2016-11-02 17:53:23]

bmcquade@chromium.org changed reviewers:
+ avi@chromium.org

[Bryan McQuade, 2016-11-02 17:53:39]

avi, PTAL for content/ changes. Here's another change that removes dead code.

[Avi (use Gerrit), 2016-11-02 17:54:26]

lgtm

all good stuff

[Bryan McQuade, 2016-11-02 18:08:24]

The CQ bit was checked by bmcquade@chromium.org

[commit-bot: I haz the power, 2016-11-02 18:09:05]

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, 2016-11-02 18:19:03]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-02 18:23:53]

Description was changed from

==========
Remove dead flush histograms code.

In https://codereview.chromium.org/2437863005, page_load_histograms,
which was the only consumer of this code, was removed. Now that the
page_load_histograms code has been removed, this code can be removed as
well.

This change is also a follow up to https://codereview.chromium.org/2231843002,
which disabled histogram flushing when persistence was enabled. Now that
page_load_histograms is gone, we can remove the flushing logic entirely.

BUG=657993
==========

to

==========
Remove dead flush histograms code.

In https://codereview.chromium.org/2437863005, page_load_histograms,
which was the only consumer of this code, was removed. Now that the
page_load_histograms code has been removed, this code can be removed as
well.

This change is also a follow up to https://codereview.chromium.org/2231843002,
which disabled histogram flushing when persistence was enabled. Now that
page_load_histograms is gone, we can remove the flushing logic entirely.

BUG=657993

Committed: https://crrev.com/d48284c61aefddb82c657751c59d4a32e5b4fd3c
Cr-Commit-Position: refs/heads/master@{#429346}
==========

[commit-bot: I haz the power, 2016-11-02 18:23:54]

Patchset 2 (id:??) landed as
https://crrev.com/d48284c61aefddb82c657751c59d4a32e5b4fd3c
Cr-Commit-Position: refs/heads/master@{#429346}