Revert of Add builders for tracing event's structural arguments

cc/trees/proxy.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/proxy.h"
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/single_thread_task_runner.h"
 
 namespace cc {
@@ skipping 65 matching lines @@
       main_thread_id_(base::PlatformThread::CurrentId()),
       impl_thread_is_overridden_(false),
       is_main_thread_blocked_(false) {
 #endif
 }
 
 Proxy::~Proxy() {
   DCHECK(IsMainThread());
 }
 
+scoped_ptr<base::Value> Proxy::SchedulerAsValueForTesting() {
+  return make_scoped_ptr(base::Value::CreateNullValue());
+}
+
 }  // namespace cc