android: Small LocaleUtils cleanup

This CL removes un-necessary allocations in LocaleUtils.java
and moves the matching Python CHROME_TO_ANDROID_LANGUAGE_MAP
variable to resource_utils.py, in preparation of a future CL
where it will be used by another Python script as well.

BUG=846633
R=agrieve@chromium.org, jbudorick@chromium.org, estevenson@chromium.org

Change-Id: Ie6eba71b259c2fef410afe526b7478dc56866887
Reviewed-on: https://chromium-review.googlesource.com/1106162
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: David Turner <digit@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568507}
3 files changed