Cleaning up some code in UINQEService

chrome/browser/net/nqe/ui_network_quality_estimator_service.cc

Index: chrome/browser/net/nqe/ui_network_quality_estimator_service.cc
diff --git a/chrome/browser/net/nqe/ui_network_quality_estimator_service.cc b/chrome/browser/net/nqe/ui_network_quality_estimator_service.cc
index 208f29f67cd85290020618002c42f1b49cf264e2..3378ce3eedb5f6d7b071072f2a4760bdce1c8259 100644
--- a/chrome/browser/net/nqe/ui_network_quality_estimator_service.cc
+++ b/chrome/browser/net/nqe/ui_network_quality_estimator_service.cc
@@ -57,26 +57,29 @@ class UINetworkQualityEstimatorService::IONetworkQualityObserver
             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);