Revert of Add builders for tracing event's structural arguments

cc/scheduler/scheduler_state_machine.h

Index: cc/scheduler/scheduler_state_machine.h
diff --git a/cc/scheduler/scheduler_state_machine.h b/cc/scheduler/scheduler_state_machine.h
index d92a352f236af27058d8068174c8bd2d04092ac0..0fbdf412254b3cfba0966a8de7eaa0b50b1ec41f 100644
--- a/cc/scheduler/scheduler_state_machine.h
+++ b/cc/scheduler/scheduler_state_machine.h
@@ -16,10 +16,6 @@
 #include "cc/scheduler/scheduler_settings.h"
 
 namespace base {
-namespace debug {
-class ConvertableToTraceForamt;
-class TracedValue;
-}
 class Value;
 }
 
@@ -106,8 +102,7 @@
   };
   static const char* ActionToString(Action action);
 
-  scoped_refptr<base::debug::ConvertableToTraceFormat> AsValue() const;
-  void AsValueInto(base::debug::TracedValue* dict) const;
+  scoped_ptr<base::Value> AsValue() const;
 
   Action NextAction() const;
   void UpdateState(Action action);