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This affects metrics in one case for WebVR: WebVR presentation sessions
started by headset activation will be counted as requestPresent.
This seems like a reasonable tradeoff for this simplification since
WebVR is deprecated and such scenarios are likely rare.

The use in VRDisplay's constructor was not actually necessary since
this is a non-immersive session.

Bug: 842025
Change-Id: I08d4712967c1ce2720e93f85d7679a2f915a6b65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1629178Reviewed-by: Bill Orr <billorr@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664109}