Revert "Enable PerformanceMonitor power metrics on Android"

This reverts commit 0eb8b44e602a29d423a5ec00cf62b0e346633fd2.

Reason for revert: This depends on https://chromium-review.googlesource.com/c/chromium/src/+/6468605 which needs to be reverted for causing consistent test failures on automotive.

Bug: 412634171
Original change's description:
> Enable PerformanceMonitor power metrics on Android
>
> Also defines ChildProcessTerminationInfo.cpu_usage unconditionally since
> it's referenced in ProcessMonitor, although it will always be set to
> nullopt on Android.
>
> Bug: 412634171
> Change-Id: I91d927fca61f9a986b47b3c2ad9750b44f4760e3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6468606
> Commit-Queue: Joe Mason <joenotcharles@google.com>
> Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
> Reviewed-by: Luc Nguyen <lucnguyen@google.com>
> Cr-Commit-Position: refs/heads/main@{#1455944}

Bug: 412634171
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I111c17df3356b891dd7f2ac99af7c919d93ced40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6516071
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Owners-Override: Ioana Pandele <ioanap@chromium.org>
Auto-Submit: Ioana Pandele <ioanap@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1456267}