Backed out 2 changesets (bug 871590) CLOSED TREE
Bug 871002 - Use uint32 comparisons more often, r=jandem.
Bug 857845 part 3 - Remove JM JSAPI flags, memory reporters and browser prefs. r=djvj

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extra : rebase_source : 8b2ed85801fcd8c8fd0fc16a89b1a275add1a310