Disables session restore on chrome os when running tests. This causes problems with some tests as the nested message loop run by session restore gets prematurely exited and Chrome is left in a weird state.
Disables session restore on chrome os when running tests. This causes
problems with some tests as the nested message loop run by session
restore gets prematurely exited and Chrome is left in a weird state.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/294009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@29515 0039d316-1c4b-4281-b951-d872f2087c98

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