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Language pak files were moved to res/raw when split apks was being implemented.
Moving them to assets with a java constant keeping track of pak file locations
will improve lookup time and save some space (no more xml files and
resources.arsc).

BUG=529604

Review-Url: https://codereview.chromium.org/2345143002
Cr-Commit-Position: refs/heads/master@{#420641}