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- [x] Add a new header 'dev_fs_path_b64' which is used over 'dev_fs_path' when present. - [x] 'dev_fs_path_b64' expects the path encoded as UTF8 and then BASE64. - [x] Add unit test case. BUG= R=turnidge@google.com Review URL: https://codereview.chromium.org/2386123005 .