[Extensions] Fix improper extension tab ownership bug

[Extensions] Fix improper extension tab ownership bug

An extension can "own" a tab if it owns the main frame, and
we block content scripts in this case. But there was a race
that meant the tab wasn't being updated in time for document_start.
Instead of informing the tab of its owner across IPC, use the
security origin of the top frame, since this can now be
accessed from remote frames as well.

BUG=507461
Committed: https://crrev.com/f01734ae15fc5c2a39181b25999683d336109dbf
Cr-Commit-Position: refs/heads/master@{#338300}

[Devlin, 2015-07-09 21:17:16]

rdevlin.cronin@chromium.org changed reviewers:
+ kalman@chromium.org

[not at google - send to devlin, 2015-07-09 21:39:30]

lgtm

https://codereview.chromium.org/1225413002/diff/1/chrome/browser/extensions/c...
File chrome/browser/extensions/content_script_apitest.cc (right):

https://codereview.chromium.org/1225413002/diff/1/chrome/browser/extensions/c...
chrome/browser/extensions/content_script_apitest.cc:582:
DocumentStartInjectionFromExtensionTabNavigation) {
(clang-format should fix this)

[Devlin, 2015-07-10 00:58:23]

https://codereview.chromium.org/1225413002/diff/1/chrome/browser/extensions/c...
File chrome/browser/extensions/content_script_apitest.cc (right):

https://codereview.chromium.org/1225413002/diff/1/chrome/browser/extensions/c...
chrome/browser/extensions/content_script_apitest.cc:582:
DocumentStartInjectionFromExtensionTabNavigation) {
On 2015/07/09 21:39:30, kalman wrote:
> (clang-format should fix this)

But, for some reason, it didn't complain.  Done.

[Devlin, 2015-07-10 00:58:38]

rdevlin.cronin@chromium.org changed reviewers:
+ nasko@chromium.org

[Devlin, 2015-07-10 00:58:39]

+Nasko for messages.

[nasko, 2015-07-10 09:11:13]

My favorite type of CLs - code removal -> always LGTM!

[Devlin, 2015-07-10 15:17:50]

The CQ bit was checked by rdevlin.cronin@chromium.org

[Devlin, 2015-07-10 15:17:50]

The patchset sent to the CQ was uploaded after l-g-t-m from kalman@chromium.org
Link to the patchset: https://codereview.chromium.org/1225413002/#ps20001
(title: " ")

[commit-bot: I haz the power, 2015-07-10 15:18:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1225413002/20001

[commit-bot: I haz the power, 2015-07-10 16:03:28]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-10 16:04:16]

Patchset 2 (id:??) landed as
https://crrev.com/f01734ae15fc5c2a39181b25999683d336109dbf
Cr-Commit-Position: refs/heads/master@{#338300}