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When running 'chrome --mash' on device, all the resource files necessary
for ash, mus etc. apps are already in the resource files used for regular
chrome. So instead of deploying separate resource files for these apps,
just load chrome's resource files, before initializing the app.

BUG=628715, 633656

Review-Url: https://codereview.chromium.org/2387233002
Cr-Commit-Position: refs/heads/master@{#422694}