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URLLoaderThrottleProviderImpl and WebSocketHandshakeThrottleProviderImpl
used content::RenderThread::Get()->GetConnector() to connect mojo
interfaces. This prevented us from creating these throttle providers
on the IO thread. To allow these throttle providers can be constructed
without going to the main thread, create a clone of the main thread's
connector in ChromeContentRendererClient::RenderThreadStarted().
The cloned connector is bound to the IO thread and will be used
to create throttle providers for off-the-main-thread service worker
startup.

Bug: 989781
Change-Id: Ic4d20813e18c6238700545946cbcfd6f4534d974
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724754Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684169}