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This test will pass only after http://codereview.chromium.org/8262009 lands.
* Rename CloseAllBrowsersAndExitPosted to ExitPosted.
* Add VerifyCleanExit to UITest, code which existed in BrowserTest.SessionEnd.
* Move ui tests in browser_uitest.cc to non-anonymous namespace; the test names need to be unique.
* Create UnloadTest.BrowserTerminateBeforeUnload which sets up onbeforeunload handler and sends a SIGTERM.

BUG=chromium-os:21961
TEST=UnloadTest.BrowserTerminateBeforeUnload passes.
Review URL: http://codereview.chromium.org/8376001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107163 0039d316-1c4b-4281-b951-d872f2087c98