base: tighten the deps entries a little bit
base: tighten the deps entries a little bit

dmg_fp is not needed because it is under base and mach_override is no
needed because there is no includes of it on base.

BUG=None
TEST=./buildtools/checkdeps/checkdeps.py base
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1523413002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#365393}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk