file_manager: Add DELETED_prefix to the enum of a removed function

Forgot to do this in crrev.com/210491

BUG=256952
TEST=none
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Review URL: https://codereview.chromium.org/18039004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@210703 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed