Print Preview: Use the global PrintPreviewTabController in unit tests.

chrome/browser/ui/webui/print_preview_handler_unittest.cc

 // Copyright (c) 2011 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/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/printing/background_printing_manager.h"
 #include "chrome/browser/printing/print_preview_tab_controller.h"
@@ skipping 41 matching lines @@
   virtual void TearDown() {
     DeletePrintPreviewTab();
     ClearStickySettings();
   }
 
   void OpenPrintPreviewTab() {
     TabContentsWrapper* initiator_tab =
         browser()->GetSelectedTabContentsWrapper();
     ASSERT_TRUE(initiator_tab);
 
-    scoped_refptr<printing::PrintPreviewTabController>
-        controller(new printing::PrintPreviewTabController());
-    ASSERT_TRUE(controller.get());
+    printing::PrintPreviewTabController* controller =
+        printing::PrintPreviewTabController::GetInstance();
+    ASSERT_TRUE(controller);
 
     preview_tab_ = controller->GetOrCreatePreviewTab(initiator_tab);
     ASSERT_TRUE(preview_tab_);
 
     preview_ui_ = static_cast<PrintPreviewUI*>(preview_tab_->web_ui());
     ASSERT_TRUE(preview_ui_);
   }
 
   void DeletePrintPreviewTab() {
     printing::BackgroundPrintingManager* bg_printing_manager =
@@ skipping 208 matching lines @@
   double margin_value;
   EXPECT_FALSE(initial_settings.GetDouble(printing::kSettingMarginTop,
                                           &margin_value));
   EXPECT_FALSE(initial_settings.GetDouble(printing::kSettingMarginRight,
                                           &margin_value));
   EXPECT_FALSE(initial_settings.GetDouble(printing::kSettingMarginBottom,
                                           &margin_value));
   EXPECT_FALSE(initial_settings.GetDouble(printing::kSettingMarginLeft,
                                           &margin_value));
 }