cc: Remove ScopedTrackers in SingleThreadProxy.

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index 4fa133cb3538e608f32053b216d68aef12fdcfc4..d603086725b002350f2a8733dfd6743129563fc9 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -592,11 +592,6 @@ void Scheduler::OnBeginImplFrameDeadline() {
   //     order to wait for more user-input before starting the next commit.
   // * Creating a new OuputSurface will not occur during the deadline in
   //     order to allow the state machine to "settle" first.
-
-  // TODO(robliao): Remove ScopedTracker below once crbug.com/461509 is fixed.
-  tracked_objects::ScopedTracker tracking_profile1(
-      FROM_HERE_WITH_EXPLICIT_FUNCTION(
-          "461509 Scheduler::OnBeginImplFrameDeadline1"));
   compositor_timing_history_->WillFinishImplFrame(
       state_machine_.needs_redraw());
   state_machine_.OnBeginImplFrameDeadline();
@@ -666,11 +661,6 @@ void Scheduler::ProcessScheduledActions() {
         client_->ScheduledActionSendBeginMainFrame(begin_main_frame_args_);
         break;
       case SchedulerStateMachine::ACTION_COMMIT: {
-        // TODO(robliao): Remove ScopedTracker below once crbug.com/461509 is
-        // fixed.
-        tracked_objects::ScopedTracker tracking_profile4(
-            FROM_HERE_WITH_EXPLICIT_FUNCTION(
-                "461509 Scheduler::ProcessScheduledActions4"));
         bool commit_has_no_updates = false;
         state_machine_.WillCommit(commit_has_no_updates);
         client_->ScheduledActionCommit();
@@ -682,15 +672,9 @@ void Scheduler::ProcessScheduledActions() {
         client_->ScheduledActionActivateSyncTree();
         compositor_timing_history_->DidActivate();
         break;
-      case SchedulerStateMachine::ACTION_DRAW_AND_SWAP_IF_POSSIBLE: {
-        // TODO(robliao): Remove ScopedTracker below once crbug.com/461509 is
-        // fixed.
-        tracked_objects::ScopedTracker tracking_profile6(
-            FROM_HERE_WITH_EXPLICIT_FUNCTION(
-                "461509 Scheduler::ProcessScheduledActions6"));
+      case SchedulerStateMachine::ACTION_DRAW_AND_SWAP_IF_POSSIBLE:
         DrawAndSwapIfPossible();
         break;
-      }
       case SchedulerStateMachine::ACTION_DRAW_AND_SWAP_FORCED:
         DrawAndSwapForced();
         break;