Bug 918220. Part 1. Rename the pref content.image.allow_locking to make it clear that it only applies to content processes. r=jmuizelaar
Bug 918220. Part 2. Remove image.mem.allow_locking_in_content_processes pref from fennec pref file, it doesn't apply to fennec because it doesn't have content processes and could be confusing. Also, give the pref a default value in all.js. r=jmuizelaar
Bug 836284 - Handle negative slice times in GC stats reporter; r=billm

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extra : rebase_source : 349d2adeb511eb563f3a468583991b7016b8ed76