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This will give us reasons for 6 of the top 7 most common failing methods. RenameFile doesn't have a histogram because base::ReplaceFile only returns a bool. Plumbing an error value is planned.

BUG=225051


Review URL: https://chromiumcodereview.appspot.com/13838003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193012 0039d316-1c4b-4281-b951-d872f2087c98