Change the launcher to create new tabs instead of windows when

ash/launcher/launcher_delegate.h

Index: ash/launcher/launcher_delegate.h
diff --git a/ash/launcher/launcher_delegate.h b/ash/launcher/launcher_delegate.h
index 674f557a690b7da2f808387aaf654ce6e3ef2a04..e93a73538688fd7e0fec2db0da37cd3c061c5253 100644
--- a/ash/launcher/launcher_delegate.h
+++ b/ash/launcher/launcher_delegate.h
@@ -22,8 +22,8 @@ class ASH_EXPORT LauncherDelegate {
   virtual ~LauncherDelegate() {}
 
   // Invoked when the user clicks on button in the launcher to create a new
-  // window.
-  virtual void CreateNewWindow() = 0;
+  // tab.
+  virtual void CreateNewTab() = 0;
 
   // Invoked when the user clicks on a window entry in the launcher.
   virtual void ItemClicked(const LauncherItem& item) = 0;