Cleanup incognito profile

Tabcontrol now destroys the incognito profile when the
last incognito tab is closed.

Change-Id: I20513a7cee1dc9c0cbf116ac182e5c80de0adfe2
diff --git a/src/com/android/browser/TabControl.java b/src/com/android/browser/TabControl.java
index 91d2bca..00f3c44 100644
--- a/src/com/android/browser/TabControl.java
+++ b/src/com/android/browser/TabControl.java
@@ -22,6 +22,7 @@
 
 import org.codeaurora.swe.GeolocationPermissions;
 import org.codeaurora.swe.WebView;
+import org.codeaurora.swe.Engine;
 import org.codeaurora.swe.util.Observable;
 
 import java.util.ArrayList;
@@ -306,6 +307,7 @@
             mNumIncognito -= 1;
             if (mNumIncognito == 0) {
                 GeolocationPermissions.onIncognitoTabsRemoved();
+                Engine.destroyIncognitoProfile();
             }
         }