Remove dead paint flush tracking code.

Remove dead paint flush tracking 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
Committed: https://crrev.com/1f070c52d32c8884c5ffc39cab50ca6cc7cb02bf
Cr-Commit-Position: refs/heads/master@{#429329}

[Bryan McQuade, 2016-10-24 17:20:07]

Description was changed from

==========
Remove unused paint flush tracking logic.

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 paint flush tracking 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
==========

[Bryan McQuade, 2016-11-02 13:43:34]

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

[commit-bot: I haz the power, 2016-11-02 13:43:49]

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 13:57:17]

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

[Bryan McQuade, 2016-11-02 13:57:51]

avi, PTAL - this removes some now dead code in content/. Thanks!

[commit-bot: I haz the power, 2016-11-02 14:26:30]

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

[commit-bot: I haz the power, 2016-11-02 14:26:31]

Dry run: This issue passed the CQ dry run.

[Avi (use Gerrit), 2016-11-02 17:33:31]

lgtm

👍

[Bryan McQuade, 2016-11-02 17:44:42]

The CQ bit was checked by bmcquade@chromium.org

[commit-bot: I haz the power, 2016-11-02 17:45:26]

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 17:51:19]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-02 17:56:49]

Description was changed from

==========
Remove dead paint flush tracking 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 paint flush tracking 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

Committed: https://crrev.com/1f070c52d32c8884c5ffc39cab50ca6cc7cb02bf
Cr-Commit-Position: refs/heads/master@{#429329}
==========

[commit-bot: I haz the power, 2016-11-02 17:56:50]

Patchset 2 (id:??) landed as
https://crrev.com/1f070c52d32c8884c5ffc39cab50ca6cc7cb02bf
Cr-Commit-Position: refs/heads/master@{#429329}