Bug 847236 - Simplify the dead nsEventTargetChainItem objects cache (2nd attempt).  r=smaug.

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extra : rebase_source : c46d667fbcc56bdc1826ea61bc62f656f79c3919
Bug 818014: strip null bytes in document titles when setting the chrome window's title, since some platform nsWindow::SetTitle implementations don't handle them correctly, r=dolske

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extra : rebase_source : 1e161ed51b2cd1c8125982341878f454d8cd2339
Back out fe7fa32e9423 (bug 848423) for Windows build bustage
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