Bug 706885 - Move post barrier verifier to JSRuntime; r=billm

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extra : rebase_source : 0ecc660996501fb54573cc0081a12bbca838e45d
Bug 838256: Add periods at the end of sentences in nsHTMLTagList.h header-comment. r=hsivonen
Bug 838394: Remove redundant/unnecessary NS_WARNING in nsMixedContentBlocker::ShouldLoad, and replace MOZ_NOT_REACHED with MOZ_ASSERT(false) to get defined behavior. r=tanvi r=smaug