Use the new service protocol message names (#35482)

* Use the new service protocol message names
  clearVMTimeline
  setVMTimelineFlags
  getVMTimeline
  getVMTimelineFlags

* Fix clearTimeline at another spot.
diff --git a/packages/flutter_tools/lib/src/vmservice.dart b/packages/flutter_tools/lib/src/vmservice.dart
index dcdac64..af9af23 100644
--- a/packages/flutter_tools/lib/src/vmservice.dart
+++ b/packages/flutter_tools/lib/src/vmservice.dart
@@ -948,13 +948,13 @@
   }
 
   Future<Map<String, dynamic>> clearVMTimeline() {
-    return invokeRpcRaw('_clearVMTimeline');
+    return invokeRpcRaw('clearVMTimeline');
   }
 
   Future<Map<String, dynamic>> setVMTimelineFlags(List<String> recordedStreams) {
     assert(recordedStreams != null);
     return invokeRpcRaw(
-      '_setVMTimelineFlags',
+      'setVMTimelineFlags',
       params: <String, dynamic>{
         'recordedStreams': recordedStreams,
       },
@@ -962,7 +962,7 @@
   }
 
   Future<Map<String, dynamic>> getVMTimeline() {
-    return invokeRpcRaw('_getVMTimeline');
+    return invokeRpcRaw('getVMTimeline');
   }
 
   Future<void> refreshViews({ bool waitForViews = false }) async {