Bug 726716: Keyboard shortcuts for Fennec. [r=mfinkle]

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extra : rebase_source : fa0d362face86e9b7d28d2a3e079edf5fd43d283
Bug 836132 - update x-frame-options ALLOW-FROM parsing to conform to IETF internet draft. (r=bz,geekboy)
Bug 836132 - add more tests for x-frame-options ALLOW-FROM. (r=bz)