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Chrome Cleanup's functionality can be powered by an external company.
When this is the case, we want to show attribution in the WebUI. This is
done through the text "Powered by" followed by the company's logo inlined
in the text, then the registered trademark symbol.

Also fixes a line-split issue for the file paths to be removed and makes
some static chrome_cleaner_controller methods into class methods.

Bug: 690020
Change-Id: I87acfeb4a6ee95cbdd197318b3596f93f819c520
Reviewed-on: https://chromium-review.googlesource.com/568399
Commit-Queue: proberge <proberge@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487246}