Sever PendingExtensionManager's dependency on ExtensionService

Sever PendingExtensionManager's dependency on ExtensionService

PendingExtensionManager has no reason to depend on ExtensionService.  So remove
it.

If there is a desire for PendingExtensionManager to be in /extensions, it would
be very easy to do so - the only thing keeping it in /chrome is a constant.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271855

[Devlin, 2014-05-20 17:41:05]

Fairly small one. :)  If there's any desire for PendingExtensionManager to be in
/extensions, I can move it as part of this CL.

[Yoyo Zhou, 2014-05-20 21:04:52]

LGTM
We can move it later if necessary.

[Devlin, 2014-05-20 21:05:22]

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

[commit-bot: I haz the power, 2014-05-20 21:08:08]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rdevlin.cronin@chromium.org/297613002/1

[commit-bot: I haz the power, 2014-05-21 00:16:47]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-05-21 03:55:56]

Change committed as 271855