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In favor of less things to have in gdata_file_system.h, which is
overly large.

BUG=chromium-os:29215
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10219006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133807 0039d316-1c4b-4281-b951-d872f2087c98