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Because Blink depends on the WebUSB interfaces directly they shouldn't
be part of chrome_content_browser_manifest_overlay.json and should
instead be part of content_browser_manifest.json. Since these are still
implemented by Chrome and not //content the factory methods are moved
into ContentBrowserClient.

Change-Id: Ic34008eccca45dd24bace5afee8fff478bb9ba6d
Reviewed-on: https://chromium-review.googlesource.com/828025Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524443}