Revert "Add trace events for measuring WebXR perf on Desktop"

This reverts commit 73c1c6256d28510dba6f3e5052c443f744f38cde.

Reason for revert: Took an unintentional dependency on newer SDK version.  Will either reland without new dependency or explicitly decide to take new dependency.

Original change's description:
> Add trace events for measuring WebXR perf on Desktop
> 
> This change exposes the same trace events as used on Android for VR to
> Windows. This will help to unblock perf tests and start to help basic
> perf investigation from chrome://tracing.
> 
> Bug: 865084
> Change-Id: If4f8cf0b3b435d70416c93436437f658843d6cc0
> Reviewed-on: https://chromium-review.googlesource.com/c/1479858
> Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
> Reviewed-by: Klaus Weidner <klausw@chromium.org>
> Commit-Queue: Bill Orr <billorr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#635364}

TBR=bsheedy@chromium.org,klausw@chromium.org,billorr@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 865084
Change-Id: Ia79d163d6dfae25f2173e7c1e79fc54369f218fb
Reviewed-on: https://chromium-review.googlesource.com/c/1497856
Reviewed-by: Bill Orr <billorr@chromium.org>
Commit-Queue: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637105}
20 files changed