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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).

Patch 1: https://codereview.chromium.org/1143593006
Patch 2: [This patch]
Patch 3: https://codereview.chromium.org/1139053004/

This is a re-land of https://codereview.chromium.org/1137103003/,
which was reverted due to trivial layout test changes.

TBR=jochen@chromium.org,philipj@opera.com,sofbjornf@opera.com,hiroshige@chromium.org
BUG=489672

Review URL: https://codereview.chromium.org/1134303009

Cr-Commit-Position: refs/heads/master@{#330700}