Fix in BrowserTest.PosixSessionEnd in ui_tests failure on dbg build for Chrome OS
Fix in BrowserTest.PosixSessionEnd in ui_tests failure on dbg build for Chrome OS

The test failed as use of Singleton is not allowed in non-joinable threads
since http://src.chromium.org/viewvc/chrome?view=rev&revision=66719

We could make BootTimesLoader a leaky singoeton to fix the failure, but
instead, the change removes the use of BootTimesLoader in the shutdown
detector thread. The time spent from the previous check point (LogoutStarted)
is negligible as shown in http://codereview.chromium.org/4973002/ hence it
should be fine.

BUG=chromium-os:9592
TEST=out/Debug/ui_tests --gtest_filter='BrowserTest.PosixSessionEnd'

Review URL: http://codereview.chromium.org/5339007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@67214 0039d316-1c4b-4281-b951-d872f2087c98

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