Remove ChromeRenderFrameObserver::HasRefreshMetaTag.

Remove ChromeRenderFrameObserver::HasRefreshMetaTag.

Instead of poking at the DOM, there is a gentler and more accurate
way to determine whether the document has a pending location
change or a redirect. Let's use it!

BUG=521166
R=jam

Committed: https://crrev.com/7829929371d16e6caeaa604d009bba534479eb20
Cr-Commit-Position: refs/heads/master@{#351021}

[dglazkov, 2015-09-25 23:27:58]

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

[commit-bot: I haz the power, 2015-09-25 23:29:04]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1363803003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1363803003/1

[commit-bot: I haz the power, 2015-09-26 00:09:20]

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

[commit-bot: I haz the power, 2015-09-26 00:09:20]

Dry run: This issue passed the CQ dry run.

[dglazkov, 2015-09-26 00:11:36]

PTAL.

[jam, 2015-09-28 02:49:48]

lgtm

[dglazkov, 2015-09-28 03:07:13]

The CQ bit was checked by dglazkov@chromium.org

[commit-bot: I haz the power, 2015-09-28 03:07:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1363803003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1363803003/1

[commit-bot: I haz the power, 2015-09-28 04:10:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-28 04:11:27]

Patchset 1 (id:??) landed as
https://crrev.com/7829929371d16e6caeaa604d009bba534479eb20
Cr-Commit-Position: refs/heads/master@{#351021}