Cleaning up some code in UINQEService

chrome/browser/net/nqe/ui_network_quality_estimator_service.cc

 // Copyright 2016 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 "chrome/browser/net/nqe/ui_network_quality_estimator_service.h"
 
 #include "base/bind.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/io_thread.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 46 matching lines @@
             service_, type));
   }
 
  private:
   base::WeakPtr<UINetworkQualityEstimatorService> service_;
   net::NetworkQualityEstimator* network_quality_estimator_;
 
   DISALLOW_COPY_AND_ASSIGN(IONetworkQualityObserver);
 };
 
-UINetworkQualityEstimatorService::UINetworkQualityEstimatorService(
-    Profile* profile)
+UINetworkQualityEstimatorService::UINetworkQualityEstimatorService()
     : type_(net::NetworkQualityEstimator::EFFECTIVE_CONNECTION_TYPE_UNKNOWN),
       io_observer_(nullptr),
       weak_factory_(this) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  // If this is running in a context without an IOThread, don't try to create
+  // the IO object.
+  if (!g_browser_process->io_thread())
+    return;
   io_observer_ = new IONetworkQualityObserver(weak_factory_.GetWeakPtr());
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,
       base::Bind(&IONetworkQualityObserver::InitializeOnIOThread,
                  base::Unretained(io_observer_),
                  g_browser_process->io_thread()));
 }
 
 UINetworkQualityEstimatorService::~UINetworkQualityEstimatorService() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 }
 
 void UINetworkQualityEstimatorService::Shutdown() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   weak_factory_.InvalidateWeakPtrs();
 }
 
 void UINetworkQualityEstimatorService::EffectiveConnectionTypeChanged(
     net::NetworkQualityEstimator::EffectiveConnectionType type) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   type_ = type;
 }
 
 net::NetworkQualityEstimator::EffectiveConnectionType
 UINetworkQualityEstimatorService::GetEffectiveConnectionType() const {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   return type_;
 }