Revert "Add field trial config for local PDP detection metric"

This reverts commit 60ac464902e3392e58c96e2dcf98cc0914cd5c07.

Reason for revert: crbug.com/1482472. The PDP detection seems to be
causing some performance regression, specifically memory regression
reported by V8. Reverting for now to investigate the regression. 

Original change's description:
> Add field trial config for local PDP detection metric
>
> Bug: b:278291710
> Change-Id: I32927ac17df54490c20304caad20f417fa9c6300
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4856016
> Reviewed-by: Matthew Jones <mdjones@chromium.org>
> Commit-Queue: Yue Zhang <yuezhanggg@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1196040}

Bug: b:278291710
Change-Id: I94262e65c921f48cebcc629f0ffd15179d623f77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4863232
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Auto-Submit: Yue Zhang <yuezhanggg@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1196810}