Bug 1013078 (part 1) - Remove some dead code left over from the removal of the Leaky tool. r=dbaron.

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extra : rebase_source : 2382c476375c0f51c14800c1e8f363363737807e
Bug 1013078 (part 2) - Remove some dead code in tools/jprof/stub/libmalloc.h. r=dbaron.

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extra : rebase_source : 6d94aa82432e255684dacefb3e39891cb1bdc208