Change the launcher to create new tabs instead of windows when

chrome/browser/ui/views/ash/launcher/chrome_launcher_delegate.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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_ASH_LAUNCHER_CHROME_LAUNCHER_DELEGATE_H_
 #define CHROME_BROWSER_UI_VIEWS_ASH_LAUNCHER_CHROME_LAUNCHER_DELEGATE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 126 matching lines @@
   // launcher, the running instance is pinned. If there is no running instance,
   // a new launcher item is created with |app_type| and pinned.
   void PinAppWithID(const std::string& app_id, AppType app_type);
 
   // Unpins any app items whose id is |app_id|.
   void UnpinAppsWithID(const std::string& app_id);
 
   ash::LauncherModel* model() { return model_; }
 
   // ash::LauncherDelegate overrides:
-  virtual void CreateNewWindow() OVERRIDE;
+  virtual void CreateNewTab() OVERRIDE;
   virtual void ItemClicked(const ash::LauncherItem& item) OVERRIDE;
   virtual int GetBrowserShortcutResourceId() OVERRIDE;
   virtual string16 GetTitle(const ash::LauncherItem& item) OVERRIDE;
   virtual ui::MenuModel* CreateContextMenu(
       const ash::LauncherItem& item) OVERRIDE;
   virtual ash::LauncherID GetIDByWindow(aura::Window* window) OVERRIDE;
 
   // ash::LauncherModelObserver overrides:
   virtual void LauncherItemAdded(int index) OVERRIDE;
   virtual void LauncherItemRemoved(int index, ash::LauncherID id) OVERRIDE;
@@ skipping 61 matching lines @@
 
   // Used to load the image for an app tab.
   scoped_ptr<AppIconLoader> app_icon_loader_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeLauncherDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_ASH_LAUNCHER_CHROME_LAUNCHER_DELEGATE_H_