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The implementation of the fuchsia.sys.Runner for Cast apps is refactored
to be easier to maintain, in the following ways:

1. Instead of deriving from WebContentRunner and overriding certain
   behaviours, the CastRunner now instantiates WebContentRunner instances
   internally, to use to manage CastComponents.

2. CastRunner now implements fuchsia.sys.Runner itself, and manages the
   PendingCastComponents, prior to creating & handing off CastComponents
   to be managed by the WebContentRunner(s).

3. The CreateContextParams for the main and isolated contexts are
   constructed using a common base, rather than copying & filtering the
   main context parameters, to create parameters for isolated contexts.

Bug: 1071544
Change-Id: Ic66ca0a9805e9b00d213c62845e5101ff9dea76e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153055
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761177}