Remove net URLRequest trace events.

content/browser/loader/resource_scheduler.cc

 // Copyright (c) 2012 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 <set>
 
 #include "content/browser/loader/resource_scheduler.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
@@ skipping 153 matching lines @@
       : ResourceMessageDelegate(request),
         client_id_(client_id),
         client_state_on_creation_(scheduler->GetClientState(client_id_)),
         request_(request),
         ready_(false),
         deferred_(false),
         classification_(NORMAL_REQUEST),
         scheduler_(scheduler),
         priority_(priority),
         fifo_ordering_(0) {
-    TRACE_EVENT_ASYNC_BEGIN1("net", "URLRequest", request_,
-                             "url", request->url().spec());
   }
 
   ~ScheduledResourceRequest() override { scheduler_->RemoveRequest(this); }
 
   void Start() {
-    TRACE_EVENT_ASYNC_STEP_PAST0("net", "URLRequest", request_, "Queued");
     ready_ = true;
     if (!request_->status().is_success())
       return;
     base::TimeTicks time = base::TimeTicks::Now();
     ClientState current_state = scheduler_->GetClientState(client_id_);
     // Note: the client state isn't perfectly accurate since it won't capture
     // tabs which have switched between active and background multiple times.
     // Ex: A tab with the following transitions Active -> Background -> Active
     // will be recorded as Active.
     const char* client_state = "Other";
@@ skipping 951 matching lines @@
   client->ReprioritizeRequest(
       request, old_priority_params, new_priority_params);
 }
 
 ResourceScheduler::ClientId ResourceScheduler::MakeClientId(
     int child_id, int route_id) {
   return (static_cast<ResourceScheduler::ClientId>(child_id) << 32) | route_id;
 }
 
 }  // namespace content