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Most of the call sites simply unwrap the value from the SDK.RemoteObject
returned from evaluateInPage*, this updates the API so it returns the plain
value and adds additional methods evaluateInPageRemoteObject{|Promise} for
the handful of callsites that need a RemoteObject.

Bug: 667560
Change-Id: I067b338056089f8263b0972f6630aa1e821eb846
Reviewed-on: https://chromium-review.googlesource.com/792010
Commit-Queue: Will Chen <chenwilliam@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519914}