Fix stagnant Favicon

Sometimes going from a page with a favicon to one
without, the favicon displayed would not update.

Clearing the PageState ensures that the wrong favicon isn't shown.

Change-Id: I597be5bd0c0c47f544c35af48a16d8de0c302ad2
diff --git a/src/com/android/browser/Tab.java b/src/com/android/browser/Tab.java
index 8121ba4..d3ce38c 100644
--- a/src/com/android/browser/Tab.java
+++ b/src/com/android/browser/Tab.java
@@ -553,6 +553,10 @@
             Controller controller = (Controller)mWebViewController;
             UI ui = controller.getUi();
 
+            // Clear the page state
+            mCurrentState = new PageState(mContext,
+                    view.isPrivateBrowsingEnabled(), url);
+
             if (ui instanceof BaseUi) {
                 titleBar = ((BaseUi)ui).getTitleBar();
                 if (titleBar != null) {