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Rename the AuthorizationMode enum to stop referring to the
"extension" that performs authentication.

The extension-based authentication was removed a couple of years ago in
favor of the webview-based one (see also https://crbug.com/688565 ).

Bug: 470893
Change-Id: I80bc9d662719a2bbc83eb42ec04be78dd9527b3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816573Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698935}