Split DownloadFile::Rename into RenameAndUniquify and RenameAndAnnotate.

This matches much better with the semantics as expected by the DownloadItem.

[email protected]
BUG=159501

Review URL: https://chromiumcodereview.appspot.com/11366121

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@167028 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed