fix incognito url loading

http://b/issue?id=3349090
    removed the loading of the "browser:incognito" url

Change-Id: I47f952d372b4d69e91d4b29b3b5e5ec46a4f4fc3

core/java/android/webkit/WebView.java

@@ -2013,13 +2013,7 @@ public class WebView extends AbsoluteLayout
     }
 
     private void startPrivateBrowsing() {
-        boolean wasPrivateBrowsingEnabled = isPrivateBrowsingEnabled();
-
         getSettings().setPrivateBrowsingEnabled(true);
-
-        if (!wasPrivateBrowsingEnabled) {
-            loadUrl("browser:incognito");
-        }
     }
 
     private boolean extendScroll(int y) {