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chrome://imageburner was replaced by the new recovery tool
http://google.com/chromeos/recovery.

With this change, chrome://imageburner just redirects to
the new recovery tool page.

Note that the D-Bus client code (ImageBurnerClient) is not removed
because it's used in imageWriterPrivate API, used in the new
recovery tool.

BUG=344279
TEST=open chrome://imageburner and you are redirected to http://google.com/chromeos/recovery

Review URL: https://codereview.chromium.org/679633002

Cr-Commit-Position: refs/heads/master@{#302042}