Bug 848150 - Update about:home favicons and Google search engine icon. r=dolske ui-r=shorlander ui-r=limi
Bug 815862 - Bump up max allowed scrolling acceleration to deal with high-dpi devices. r=Cwiiis
Bug 848949 - Null out mTargetChan when destroying AsyncChannel when using an IPC ThreadLink to prevent Use-After-Free. r=nmatsakis

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extra : rebase_source : 297952249b7c746cc80ed0c9cde22f6350d94722