Bug 956961 - FileDescriptorToFILE should always use its input.  r=bent

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extra : rebase_source : 5b5f0b5367c95ba1eb74ec158a93520675ed63ee
Bug 956961 - Open content processes' DMD log files in the parent process. r=njn

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extra : rebase_source : 2958f582f43bfac86ec29d784b4fb8825ca17257
extra : histedit_source : 96e39e36cbe506332d761c375b902284a695901a%2C245fc9ec3c6a3bbf4e5e5ce7b0da63f4477f36b9
Bug 956961 - Stop disabling sandboxing when DMD is enabled. r=kang

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extra : rebase_source : 4737cfd613c1ddee8e1a4340e819eddc151e73f7
extra : histedit_source : 2d2610a775a3ae986157f61ef3797f4e88baa922