refactor open tab code

Change-Id: Ibcffa5a55b2b7dcf56174f9dd916a565b31506e9
diff --git a/src/com/android/browser/NavScreen.java b/src/com/android/browser/NavScreen.java
index 848b7b1..4095a96 100644
--- a/src/com/android/browser/NavScreen.java
+++ b/src/com/android/browser/NavScreen.java
@@ -239,14 +239,12 @@
             showMenu();
         } else if (mNewIncognito == v) {
             mUi.hideNavScreen(true);
-            mUiController.openIncognitoTab();
+            mUiController.openTab(null, true, true, false);
         }
     }
 
     private void openNewTab() {
-        Tab tab = mUiController.createNewTab(
-                BrowserSettings.getInstance().getHomePage(),
-                false);
+        Tab tab = mUiController.openTabToHomePage();
         mAdapter.notifyDataSetChanged();
 
         if (tab != null) {