Change homepage setting handling

 Bug: 3247095
 Tweaks the setting of the homepage setting. Replaces the "set to..."
 dialog with 2 buttons, and user can now enter a blank url to get a
 blank page with title "New Tab".

Change-Id: I95bcfcd241db4b9efbde645100d2fd44c980e061
diff --git a/src/com/android/browser/TitleBar.java b/src/com/android/browser/TitleBar.java
index 6dabd76..bdef82e 100644
--- a/src/com/android/browser/TitleBar.java
+++ b/src/com/android/browser/TitleBar.java
@@ -320,13 +320,13 @@
 
     /**
      * Update the text displayed in the title bar.
-     * @param title String to display.  If null, the loading string will be
+     * @param title String to display.  If null, the new tab string will be
      *      shown.
      */
     @Override
     void setDisplayTitle(String title) {
         if (title == null) {
-            mTitle.setText(R.string.title_bar_loading);
+            mTitle.setText(R.string.new_tab);
         } else {
             if (mInVoiceMode) {
                 // Add two spaces.  The second one will be replaced with an