Remove the dependence on BrowserThread::FILE for

components/cronet/android/cronet_url_request_context_adapter.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 "components/cronet/android/cronet_url_request_context_adapter.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 493 matching lines @@
 
   // Stop NetLog observer if there is one.
   StopNetLogOnNetworkThread();
 }
 
 void CronetURLRequestContextAdapter::InitRequestContextOnInitThread(
     JNIEnv* env,
     const JavaParamRef<jobject>& jcaller) {
   base::android::ScopedJavaGlobalRef<jobject> jcaller_ref;
   jcaller_ref.Reset(env, jcaller);
-  proxy_config_service_ = net::ProxyService::CreateSystemProxyConfigService(
-      GetNetworkTaskRunner(), nullptr /* Ignored on Android */);
+  proxy_config_service_ =
+      net::ProxyService::CreateSystemProxyConfigService(GetNetworkTaskRunner());
   net::ProxyConfigServiceAndroid* android_proxy_config_service =
       static_cast<net::ProxyConfigServiceAndroid*>(proxy_config_service_.get());
   // If a PAC URL is present, ignore it and use the address and port of
   // Android system's local HTTP proxy server. See: crbug.com/432539.
   // TODO(csharrison) Architect the wrapper better so we don't need to cast for
   // android ProxyConfigServices.
   android_proxy_config_service->set_exclude_pac_url(true);
   g_net_log.Get().EnsureInitializedOnInitThread();
   GetNetworkTaskRunner()->PostTask(
       FROM_HERE,
@@ skipping 645 matching lines @@
     JNIEnv* env,
     const JavaParamRef<jclass>& jcaller) {
   DCHECK(base::StatisticsRecorder::IsActive());
   std::vector<uint8_t> data;
   if (!HistogramManager::GetInstance()->GetDeltas(&data))
     return ScopedJavaLocalRef<jbyteArray>();
   return base::android::ToJavaByteArray(env, &data[0], data.size());
 }
 
 }  // namespace cronet