Bug 918107 followup: disable tests that don't like the temporary hack, a=bustage

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extra : rebase_source : 0f30457480b7c7e9b50caffaa3e4c02761710a1d
Bug 915993 - Revert pdf.js string change. r=flod
Bug 916233 - External links in Metro should open in Metro. r=jimm, a=lsblakk
Bug 914939 - Don't assert against OOM in XPCWrappedJS QI hooks. r=gabor, a=lsblakk
Bug 916264 - Delete texture to unbound from texture. r=nical, a=koi+
Bug 917365 - Fix an exception when starting a simulator. r=paul, a=lsblakk