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Both 'chrome:' and 'chrome-devtools:' are content-level schemes; we
should do their various renderer-side scheme registrations in content
(RenderThreadImpl::RegisterSchemes) rather than in chrome
(ChromeContentRendererClient::RenderThreadStarted).

R=jochen@chromium.org

Review URL: https://codereview.chromium.org/1137103003

Cr-Commit-Position: refs/heads/master@{#330506}