Reland 124817 - Take extensions out of Profile into a profile-keyed service, ExtensionSystem.

Reland 124817 - Take extensions out of Profile into a profile-keyed service, ExtensionSystem.

Move InitExtensions into ExtensionSystem.
Remove a few accessors (ExtensionDevToolsManager, ExtensionMessageService). The others have too many callers to fix in one go.

New: PrerenderManagerFactory DependsOn ExtensionSystemFactory.

BUG=104095
TEST=Open and close an incognito window; should not crash.
TBR=aa@chromium.org,akalin@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=125805

[Yoyo Zhou, 2012-03-06 04:45:41]

erg: apparently PrerenderManager shutdown can depend on ExtensionEventRouter, so
I added a dependency there so we don't crash in prerender browser tests.

I expect it's possible there might be more yet-unknown services that have these
kind of unexpected dependencies on extensions that will require similar
declarations.

aa, akalin: as there are no other changes since the last attempt, I'll put you
down as TBR.

[Yoyo Zhou, 2012-03-06 05:55:32]

Hold off on this review -- it's still failing on trybots because
PrerenderManager isn't doing enough cleanup in Shutdown. I'll continue looking
into it.

[Yoyo Zhou, 2012-03-08 01:12:10]

After crrev.com/125263 , this is now ready for review.

[Elliot Glaysher, 2012-03-08 22:17:19]

On 2012/03/08 01:12:10, Yoyo Zhou wrote:
> After crrev.com/125263 , this is now ready for review.

rubberstamp lgtm if the change to prerender manager is all that changed.