Remove android.support.test.rule.UiThreadTestRule as chromium did in [1] and Replace android.support.test.annotation.UiThreadTest with org.chromium.base.test.UiThreadTest. Also remove unused uiThreadHandler from NetworkMonitorTest. [1] https://crrev.com/c/2332301 Bug: webrtc:11962 Change-Id: I8f3781d43d4d53d8158c39c81568d8b09b2bec6a Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/230220 Reviewed-by: Xavier Lepaul <xalep@webrtc.org> Commit-Queue: Byoungchan Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#34864}