Make `content` target build without unused data members on Linux.

content/renderer/websharedworker_proxy.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_WEBSHAREDWORKER_PROXY_H_
 #define CONTENT_RENDERER_WEBSHAREDWORKER_PROXY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 46 matching lines @@
   void OnWorkerCreated();
   void OnWorkerScriptLoadFailed();
   void OnWorkerConnected();
 
   // Routing id associated with this worker - used to receive messages from the
   // worker, and also to route messages to the worker (WorkerService contains
   // a map that maps between these renderer-side route IDs and worker-side
   // routing ids).
   int route_id_;
 
-  // The routing id for the RenderFrame that created this worker.
-  int render_frame_route_id_;
-
   MessageRouter* const router_;
 
-  // ID of our parent document (used to shutdown workers when the parent
-  // document is detached).
-  unsigned long long document_id_;
-
   // Stores messages that were sent before the StartWorkerContext message.
   std::vector<IPC::Message*> queued_messages_;
 
-  // The id for the placeholder worker instance we've stored on the
-  // browser process (we need to pass this same route id back in when creating
-  // the worker).
-  int pending_route_id_;
   ConnectListener* connect_listener_;
   bool created_;
 
   DISALLOW_COPY_AND_ASSIGN(WebSharedWorkerProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_WEBSHAREDWORKER_PROXY_H_