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UserManager is needed during MergeSessionThrottle::ShouldShowMergeSessionPage, which appears sometimes to be triggered during ChromeBrowserMainPartsLinux::PostMainMessageLoopRun.

I observed this during the test TrayAccessibilityTest.ShowMenu, as described in https://crbug.com/243364#c12. However, at most occasions this was masked by ShouldShowMergeSessionPage being actually triggered earlier.

This is restoring the order of destroying UserManager and calling ChromeBrowserMainPartsLinux::PostMainMessageLoopRun to the state before the CL https://chromiumcodereview.appspot.com/15702004/.

BUG=243364

Review URL: https://chromiumcodereview.appspot.com/15769004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202617 0039d316-1c4b-4281-b951-d872f2087c98