Fixes to most visited page

- Do not call reload when toggling the UserAgent.
- Ensure that original URL of WebView is used when updating the most
  visited entries.

Change-Id: Ic7026a125d1bdccd0a0d47dbad7daebea2131d28
diff --git a/src/com/android/browser/Tab.java b/src/com/android/browser/Tab.java
index 0a6c83d..9964413 100644
--- a/src/com/android/browser/Tab.java
+++ b/src/com/android/browser/Tab.java
@@ -1798,6 +1798,8 @@
     }
 
     String getOriginalUrl() {
+        if (mMainView != null)
+            return mMainView.getOriginalUrl();
         if (mCurrentState.mOriginalUrl == null) {
             return getUrl();
         }