Print Preview: Use the global PrintPreviewTabController in unit tests.

chrome/test/base/testing_browser_process.h

Index: chrome/test/base/testing_browser_process.h
===================================================================
--- chrome/test/base/testing_browser_process.h	(revision 110639)
+++ chrome/test/base/testing_browser_process.h	(working copy)
@@ -125,7 +125,7 @@
   void SetGoogleURLTracker(GoogleURLTracker* google_url_tracker);
   void SetProfileManager(ProfileManager* profile_manager);
   void SetIOThread(IOThread* io_thread);
-  void SetDevToolsManager(DevToolsManager*);
+  void SetDevToolsManager(DevToolsManager* manager);
   void SetBrowserPolicyConnector(policy::BrowserPolicyConnector* connector);
 
  private:
@@ -141,6 +141,8 @@
   scoped_ptr<ProfileManager> profile_manager_;
   scoped_ptr<NotificationUIManager> notification_ui_manager_;
   scoped_ptr<printing::BackgroundPrintingManager> background_printing_manager_;
+  scoped_refptr<printing::PrintPreviewTabController>
+      print_preview_tab_controller_;
   scoped_ptr<prerender::PrerenderTracker> prerender_tracker_;
   IOThread* io_thread_;
   scoped_ptr<DevToolsManager> devtools_manager_;