Remove enabled flag fix_merged_content_change_event_v2 It has been enabled 6 month. Bug: 277305460 Test: atest AccessibilityEventAndCacheTest Flag: EXEMPT removing com.android.server.accessibility.fix_merged_content_change_event_v2 Change-Id: I12b05bddcec3ec157998f0efc589a4e3fa2a3318