[cc] cleanup: remove useless comments in UpdateStateOnActivation()

cc/scheduler/scheduler_state_machine.cc

Index: cc/scheduler/scheduler_state_machine.cc
diff --git a/cc/scheduler/scheduler_state_machine.cc b/cc/scheduler/scheduler_state_machine.cc
index 947637ddb0e86551714d4c741ef80ad37a689caa..a10b52de551e2440b1f92ea897b94b43d207b0df 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -724,15 +724,12 @@ void SchedulerStateMachine::UpdateStateOnCommit(bool commit_was_aborted) {
 }
 
 void SchedulerStateMachine::UpdateStateOnActivation() {
-  // Update output surface state.
   if (output_surface_state_ == OUTPUT_SURFACE_WAITING_FOR_FIRST_ACTIVATION)
     output_surface_state_ = OUTPUT_SURFACE_ACTIVE;
 
-  // Update readback state
   if (forced_redraw_state_ == FORCED_REDRAW_STATE_WAITING_FOR_ACTIVATION)
     forced_redraw_state_ = FORCED_REDRAW_STATE_WAITING_FOR_DRAW;
 
-  // Update forced redraw state
   if (readback_state_ == READBACK_STATE_WAITING_FOR_ACTIVATION)
     readback_state_ = READBACK_STATE_WAITING_FOR_DRAW_AND_READBACK;
   else if (readback_state_ == READBACK_STATE_WAITING_FOR_REPLACEMENT_ACTIVATION)