Bug 1057914 (part 1) - Remove enumeration methods from nsICommandParams. r=ehsan.

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extra : rebase_source : 313bf18bd88f1fbdb9a308aecbab666b8ff87adf
Bug 1057914 (part 2) - Fix the style of nsCommandParams.{h,cpp}. r=ehsan.

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extra : rebase_source : 7d0dbdde81fb3f308fee47cb5c6d881cc5174ae0