Only build various flash/pnacl/ppapi code when they are enabled.

chrome/browser/browser_process_impl.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.
 
 // When each service is created, we set a flag indicating this. At this point,
 // the service initialization could fail or succeed. This allows us to remember
 // if we tried to create a service, and not try creating it over and over if
 // the creation failed.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_
@@ skipping 258 matching lines @@
   void OnAutoupdateTimer();
   bool CanAutorestartForUpdate() const;
   void RestartBackgroundInstance();
 #endif  // defined(OS_WIN) || defined(OS_LINUX) && !defined(OS_CHROMEOS)
 
   // component updater is normally not used under ChromeOS due
   // to concerns over integrity of data shared between profiles,
   // but some users of component updater only install per-user.
   scoped_ptr<component_updater::ComponentUpdateService> component_updater_;
   scoped_refptr<CRLSetFetcher> crl_set_fetcher_;
+
+#if !defined(DISABLE_NACL)
   scoped_ptr<component_updater::PnaclComponentInstaller>
       pnacl_component_installer_;
+#endif
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
   scoped_refptr<PluginsResourceService> plugins_resource_service_;
 #endif
 
   scoped_ptr<BrowserProcessPlatformPart> platform_part_;
 
   // TODO(eroman): Remove this when done debugging 113031. This tracks
   // the callstack which released the final module reference count.
   base::debug::StackTrace release_last_reference_callstack_;
 
 #if defined(ENABLE_WEBRTC)
   // Lazily initialized.
   scoped_ptr<WebRtcLogUploader> webrtc_log_uploader_;
 #endif
 
   scoped_ptr<network_time::NetworkTimeTracker> network_time_tracker_;
 
   scoped_ptr<gcm::GCMDriver> gcm_driver_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_