Limit using fullPath and URL for transfering files in the Files app.

This CL is the initial step in removing relying on paths and URLs in file_operation_manager.js and in file_transfer_controller.js files.

TEST=Tested manually copying and moving between Downloads, Drive, inside a volume. Tested creating a ZIP archive. Also, partly covered by browser_tests.
BUG=329435

Review URL: https://codereview.chromium.org/102603013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242522 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242522