Bug 1411654 - Post: Cull unused variables; guard more with MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE. r=maliu

MozReview-Commit-ID: 8EGzVISIEQZ

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extra : rebase_source : 300f6a6656b87a4b487ec7ec331446b326371665
extra : source : cfad693be9185ae858a29a715b3e5a6d2d3d6fbf