Remove unnecessary instrumentation for several jank bugs.

extensions/browser/api/dns/dns_api.cc

 // Copyright 2014 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 "extensions/browser/api/dns/dns_api.h"
 
 #include "base/bind.h"
-#include "base/profiler/scoped_tracker.h"
 #include "base/values.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/resource_context.h"
 #include "extensions/browser/api/dns/host_resolver_wrapper.h"
 #include "extensions/common/api/dns.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_errors.h"
 #include "net/log/net_log.h"
 
@@ skipping 55 matching lines @@
   if (resolve_result != net::ERR_IO_PENDING)
     OnLookupFinished(resolve_result);
 }
 
 void DnsResolveFunction::RespondOnUIThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   SendResponse(response_);
 }
 
 void DnsResolveFunction::OnLookupFinished(int resolve_result) {
-  // TODO(vadimt): Remove ScopedTracker below once crbug.com/436634 is fixed.
-  tracked_objects::ScopedTracker tracking_profile(
-      FROM_HERE_WITH_EXPLICIT_FUNCTION(
-          "436634 DnsResolveFunction::OnLookupFinished"));
-
   scoped_ptr<ResolveCallbackResolveInfo> resolve_info(
       new ResolveCallbackResolveInfo());
   resolve_info->result_code = resolve_result;
   if (resolve_result == net::OK) {
     DCHECK(!addresses_->empty());
     resolve_info->address.reset(
         new std::string(addresses_->front().ToStringWithoutPort()));
   }
   results_ = Resolve::Results::Create(*resolve_info);
   response_ = true;
 
   bool post_task_result = BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&DnsResolveFunction::RespondOnUIThread, this));
   DCHECK(post_task_result);
 
   Release();  // Added in WorkOnIOThread().
 }
 
 }  // namespace extensions