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

content/browser/media/webrtc_identity_store.cc

 // 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.
 
 #include "content/browser/media/webrtc_identity_store.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
@@ skipping 119 matching lines @@
 
 // The class represents an identity request which calls back to the external
 // client when the request completes.
 // Its lifetime is tied with the Callback held by the corresponding
 // WebRTCIdentityRequest.
 class WebRTCIdentityRequestHandle {
  public:
   WebRTCIdentityRequestHandle(
       WebRTCIdentityStore* store,
       const WebRTCIdentityStore::CompletionCallback& callback)
-      : store_(store), request_(NULL), callback_(callback) {}
+      : request_(NULL), callback_(callback) {}
 
  private:
   friend class WebRTCIdentityStore;
 
   // Cancel the request.  Does nothing if the request finished or was already
   // cancelled.
   void Cancel() {
     DCHECK_CURRENTLY_ON(BrowserThread::IO);
     if (!request_)
       return;
@@ skipping 14 matching lines @@
 
   void OnRequestComplete(int error,
                          const std::string& certificate,
                          const std::string& private_key) {
     DCHECK_CURRENTLY_ON(BrowserThread::IO);
     DCHECK(request_);
     request_ = NULL;
     base::ResetAndReturn(&callback_).Run(error, certificate, private_key);
   }
 
-  WebRTCIdentityStore* store_;
   WebRTCIdentityRequest* request_;
   WebRTCIdentityStore::CompletionCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRTCIdentityRequestHandle);
 };
 
 WebRTCIdentityStore::WebRTCIdentityStore(const base::FilePath& path,
                                          storage::SpecialStoragePolicy* policy)
     : validity_period_(base::TimeDelta::FromDays(30)),
       task_runner_(base::WorkerPool::GetTaskRunner(true)),
@@ skipping 131 matching lines @@
                                 validity_period_, result),
           base::Bind(&WebRTCIdentityStore::GenerateIdentityCallback, this,
                      request, base::Owned(result)))) {
     // Completes the request with error if failed to post the task.
     WebRTCIdentityRequestResult result(net::ERR_UNEXPECTED, "", "");
     PostRequestResult(request, result);
   }
 }
 
 }  // namespace content