Fix event page process cleanup when running in --isolate-extensions mode.

extensions/browser/process_manager.h

 // Copyright 2013 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 EXTENSIONS_BROWSER_PROCESS_MANAGER_H_
 #define EXTENSIONS_BROWSER_PROCESS_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 308 matching lines @@
   //
   // This counter provides unique IDs even when BackgroundPageData objects are
   // reset.
   uint64_t last_background_close_sequence_id_;
 
   // Tracks pending network requests by opaque ID. This is used to ensure proper
   // keepalive counting in response to request status updates; e.g., if an
   // extension URLRequest is constructed and then destroyed without ever
   // starting, we can receive a completion notification without a corresponding
   // start notification. In that case we want to avoid decrementing keepalive.
-  std::set<int> pending_network_requests_;
+  std::map<int, ExtensionHost*> pending_network_requests_;
 
   // Must be last member, see doc on WeakPtrFactory.
   base::WeakPtrFactory<ProcessManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessManager);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_PROCESS_MANAGER_H_