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The blink public API should not expose internal blink types outside
of blink. By disallowing this dependency by default we avoid
accidentally exposing those types.

Change-Id: I68883f3d7716b2309cadf32db8e5599d2fe5c8cb
Reviewed-on: https://chromium-review.googlesource.com/1028573Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553936}