[DevTools] Narrow down DevToolsNetworkTransaction surface.

chrome/browser/devtools/devtools_network_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_CONTROLLER_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_CONTROLLER_H_
 
 #include <string>
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 
 class DevToolsNetworkConditions;
 class DevToolsNetworkInterceptor;
-class DevToolsNetworkTransaction;
 
-// DevToolsNetworkController tracks DevToolsNetworkTransactions.
+// DevToolsNetworkController manages interceptors identified by client id
+// and their throttling conditions.
 class DevToolsNetworkController {
  public:
   DevToolsNetworkController();
   virtual ~DevToolsNetworkController();
 
   // Applies network emulation configuration.
   void SetNetworkState(
       const std::string& client_id,
       scoped_ptr<DevToolsNetworkConditions> conditions);
 
   base::WeakPtr<DevToolsNetworkInterceptor> GetInterceptor(
-      DevToolsNetworkTransaction* transaction);
+      const std::string& client_id);
 
  private:
   using InterceptorMap =
       base::ScopedPtrHashMap<std::string,
                              scoped_ptr<DevToolsNetworkInterceptor>>;
 
   scoped_ptr<DevToolsNetworkInterceptor> default_interceptor_;
   scoped_ptr<DevToolsNetworkInterceptor> appcache_interceptor_;
   InterceptorMap interceptors_;
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsNetworkController);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_NETWORK_CONTROLLER_H_