Deflake PrerenderBrowserTest.PrerenderSessionStorage.
Deflake PrerenderBrowserTest.PrerenderSessionStorage.

This was using NAV_ENTRY_COMMITTED as a signal that the browser had gone back to the prerender laucher page. Now it uses LOAD_STOP as a signal.

BUG=103563


Review URL: http://codereview.chromium.org/8508053

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109517 0039d316-1c4b-4281-b951-d872f2087c98

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