Bug 1070096 - Collect no SessionStore information for about:tabcrashed pages. r=ttaubert.

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extra : rebase_source : 46798a97625dcbdcc2d4ad4d697420fde4074903
Bug 1065785 - [e10s] Use session restore to reload crashed tabs. r=smacleod.

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extra : rebase_source : efbee6049f26f2e279dbe501b5af73004d9807c7