Propagate incognito mode to child tab

    Bug: http://b/issue?id=3234294
    add parent tab parameter to open tab method
    inherit parent's private browsing status
    remove one unnecessary openTab signature

Change-Id: I4edf002798d8bbdf4cafa58e5b5b442e74d5cb28
diff --git a/src/com/android/browser/IntentHandler.java b/src/com/android/browser/IntentHandler.java
index 6e0236f..cbbc482 100644
--- a/src/com/android/browser/IntentHandler.java
+++ b/src/com/android/browser/IntentHandler.java
@@ -155,7 +155,7 @@
                         // MAX_TABS. Then the url will be opened in the current
                         // tab. If a new tab is created, it will have "true" for
                         // exit on close.
-                        mController.openTabAndShow(urlData, true, appId);
+                        mController.openTabAndShow(null, urlData, true, appId);
                     }
                 }
             } else {