Remove IOThread::message_loop().

Remove IOThread::message_loop().

Instead introduce BrowserThread::UnsafeGetMessageLoop which is used in
a couple of places.  This will be removed in a follow-up change.  I
could have used UnsafeGetBrowserThread(id)->message_loop() but this is
even easier to search for.

Also, remove a couple of BrowserProcess accessors that aren't used by anybody, and that were using UnsafeGetBrowserThread.

TBR=battre@chromium.org
BUG=98716
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=112697

[Jói, 2011-12-01 17:48:07]

On 2011/12/01 15:57:36, Jói wrote:

FYI, I removed the base/ file that was in this change, will see about that in a
separate change.

[jam, 2011-12-01 19:16:12]

lgtm

[commit-bot: I haz the power, 2011-12-02 13:25:22]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/joi@chromium.org/8775014/2013

[commit-bot: I haz the power, 2011-12-02 13:25:27]

Presubmit check for 8775014-2013 failed and returned exit status 1.

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[Jói, 2011-12-02 13:27:04]

TBR battre@ for trivial change in chrome/browser/net.

[commit-bot: I haz the power, 2011-12-02 13:27:12]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/joi@chromium.org/8775014/2013

[commit-bot: I haz the power, 2011-12-02 14:47:45]

Change committed as 112697