Switch PrintViewManager, PrintPreviewMessageHandler to use WebContentsUserData.

chrome/browser/ui/webui/print_preview/print_preview_handler_unittest.cc

 // 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.
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/printing/background_printing_manager.h"
 #include "chrome/browser/printing/print_preview_tab_controller.h"
@@ skipping 50 matching lines @@
   }
 
   void OpenPrintPreviewTab() {
     TabContents* initiator_tab = chrome::GetActiveTabContents(browser());
     ASSERT_TRUE(initiator_tab);
 
     printing::PrintPreviewTabController* controller =
         printing::PrintPreviewTabController::GetInstance();
     ASSERT_TRUE(controller);
 
-    initiator_tab->print_view_manager()->PrintPreviewNow();
+    printing::PrintViewManager* print_view_manager =
+        printing::PrintViewManager::FromWebContents(
+            initiator_tab->web_contents());
+    print_view_manager->PrintPreviewNow();
     preview_tab_ = controller->GetOrCreatePreviewTab(initiator_tab);
     ASSERT_TRUE(preview_tab_);
 
     preview_ui_ = static_cast<PrintPreviewUI*>(
         preview_tab_->web_contents()->GetWebUI()->GetController());
     ASSERT_TRUE(preview_ui_);
   }
 
   void DeletePrintPreviewTab() {
     printing::BackgroundPrintingManager* bg_printing_manager =
@@ skipping 46 matching lines @@
     args.Append(new base::StringValue(json_string));  // |args| takes ownership.
     preview_ui_->handler_->HandlePrint(&args);
   }
 
   PrintPreviewUI* preview_ui_;
 
  private:
 
   TabContents* preview_tab_;
 };