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The bindings for origin trials had two utility functions to detect the
presence of the [OriginTrialEnabled] attribute on a definition. Both of
these functions were being used semi-interchangeably to check for origin
trials.

This CL merges the two utility functions to simplify the logic.

Also, there was some basic support for a [FeaturePolicy] attribute in
the utility function. This logic was removed, as the [FeaturePolicy]
was never used, and is not intended to be used in the future.

Bug: 788196
Change-Id: I2eda8e25147d30e251a1d9d076abe9a4f4b29c8a
Reviewed-on: https://chromium-review.googlesource.com/802015
Commit-Queue: Jason Chase <chasej@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520851}