Turn on component updater on chromeos, only for the pnacl component.

chrome/browser/browser_process_impl.h

Index: chrome/browser/browser_process_impl.h
diff --git a/chrome/browser/browser_process_impl.h b/chrome/browser/browser_process_impl.h
index 0d2199ff13658f551ae6107537909b7f54205751..93d1901921fb6cde17835414ab78dea0f4feaf07 100644
--- a/chrome/browser/browser_process_impl.h
+++ b/chrome/browser/browser_process_impl.h
@@ -132,6 +132,7 @@ class BrowserProcessImpl : public BrowserProcess,
   virtual prerender::PrerenderTracker* prerender_tracker() OVERRIDE;
   virtual ComponentUpdateService* component_updater() OVERRIDE;
   virtual CRLSetFetcher* crl_set_fetcher() OVERRIDE;
+  virtual PnaclComponentInstaller* pnacl_component_installer() OVERRIDE;
   virtual BookmarkPromptController* bookmark_prompt_controller() OVERRIDE;
   virtual chrome::MediaFileSystemRegistry*
       media_file_system_registry() OVERRIDE;
@@ -286,11 +287,13 @@ class BrowserProcessImpl : public BrowserProcess,
 
 #if defined(OS_CHROMEOS)
   scoped_ptr<chromeos::OomPriorityManager> oom_priority_manager_;
-#else
+#endif
+  // 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<ComponentUpdateService> component_updater_;
-
   scoped_refptr<CRLSetFetcher> crl_set_fetcher_;
-#endif
+  scoped_ptr<PnaclComponentInstaller> pnacl_component_installer_;
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
   scoped_refptr<PluginsResourceService> plugins_resource_service_;