Fix Clang build

chrome/browser/chromeos/cros/network_library.h

 // Copyright (c) 2011 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_CHROMEOS_CROS_NETWORK_LIBRARY_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_NETWORK_LIBRARY_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 395 matching lines @@
   bool support_network_scan() const { return support_network_scan_; }
   enum TechnologyFamily technology_family() const { return technology_family_; }
   const CellularApnList& provider_apn_list() const {
     return provider_apn_list_;
   }
 
   // Updates the property specified by |key| with the contents of
   // |value|.  Returns false on failure.  Upon success, returns the
   // PropertyIndex that was updated in |index|.  |index| may be NULL
   // if not needed.
-  virtual bool UpdateStatus(const std::string& key,
-                            const Value& value,
-                            PropertyIndex *index);
+  bool UpdateStatus(const std::string& key,
+                    const Value& value,
+                    PropertyIndex *index);
 
   NativeNetworkDeviceParser* device_parser() { return device_parser_.get(); }
 
  protected:
   void set_unique_id(const std::string& unique_id) { unique_id_ = unique_id; }
 
  private:
   // This allows NetworkDeviceParser and its subclasses access to
   // device privates so that they can be reconstituted during parsing.
   // The parsers only access things through the private set_ functions
@@ skipping 1194 matching lines @@
   virtual void SwitchToPreferredNetwork() = 0;
 
   // Factory function, creates a new instance and returns ownership.
   // For normal usage, access the singleton via CrosLibrary::Get().
   static NetworkLibrary* GetImpl(bool stub);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_NETWORK_LIBRARY_H_