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1. ConnectContextProvider() was returning InterfaceHandle<ContextProvider>
and also taking InterfaceRequest<ContextProvider> argument. The result
wasn't actually used. Removed the request argument.
2. Renamed the function to StartWebEngineForTests() - this name reflects
what this function does.

Change-Id: Iede1b040a13a96860a2946e8addcf15b8dbba35c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1960668Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723649}