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This CL changes the current working directory to the chromium src root
prior to running 'gn format'.

This CL also changes the exception thrown by NormalizeAndroidDepsDir()
to reference --android-deps-dir (instead of the non-existent
--android-deps-path)

BUG=1064277



Change-Id: Ia70b3c13d032027254a753e1297044055c1d61f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506079
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821876}