Make it so net/ can be built without file:// support.

net/url_request/url_request_context_builder.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.
 
 // This class is useful for building a simple URLRequestContext. Most creators
 // of new URLRequestContexts should use this helper class to construct it. Call
 // any configuration params, and when done, invoke Build() to construct the
 // URLRequestContext. This URLRequestContext will own all its own storage.
 //
 // URLRequestContextBuilder and its associated params classes are initially
@@ skipping 69 matching lines @@
   }
   void set_user_agent(const std::string& user_agent) {
     user_agent_ = user_agent;
   }
 
   // Control support for data:// requests. By default it's disabled.
   void set_data_enabled(bool enable) {
     data_enabled_ = enable;
   }
 
+#if !defined(DISABLE_FILE_SUPPORT)
   // Control support for file:// requests. By default it's disabled.
   void set_file_enabled(bool enable) {
     file_enabled_ = enable;
   }
+#endif
 
 #if !defined(DISABLE_FTP_SUPPORT)
   // Control support for ftp:// requests. By default it's disabled.
   void set_ftp_enabled(bool enable) {
     ftp_enabled_ = enable;
   }
 #endif
 
   // By default host_resolver is constructed with CreateDefaultResolver.
   void set_host_resolver(HostResolver* host_resolver) {
@@ skipping 24 matching lines @@
     http_network_session_params_ = http_network_session_params;
   }
 
   URLRequestContext* Build();
 
  private:
   std::string accept_language_;
   std::string user_agent_;
   // Include support for data:// requests.
   bool data_enabled_;
+#if !defined(DISABLE_FILE_SUPPORT)
   // Include support for file:// requests.
   bool file_enabled_;
+#endif
 #if !defined(DISABLE_FTP_SUPPORT)
   // Include support for ftp:// requests.
   bool ftp_enabled_;
 #endif
   bool http_cache_enabled_;
   HttpCacheParams http_cache_params_;
   HttpNetworkSessionParams http_network_session_params_;
   scoped_ptr<HostResolver> host_resolver_;
   scoped_ptr<ProxyConfigService> proxy_config_service_;
   scoped_ptr<NetworkDelegate> network_delegate_;
   scoped_ptr<FtpTransactionFactory> ftp_transaction_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextBuilder);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_BUILDER_H_