Use base::test::EqualsProto

This is a pure code health clean-up CL for tests that roll their own
custom proto matcher. It removes those custom matchers and use the
equivalent one in base instead.

This CL was uploaded by git cl split.

R=jood@google.com

Bug: 411750423
Change-Id: I99ac1a3a75c1f9fdabe8fa56fb99b69878eb6ad6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6469994
Auto-Submit: Jan Keitel <jkeitel@google.com>
Commit-Queue: Jan Keitel <jkeitel@google.com>
Reviewed-by: Jood Hajeer <jood@google.com>
Cr-Commit-Position: refs/heads/main@{#1449889}