Fixed memory leak in IncognitoActivity

app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java

@@ -1099,7 +1099,7 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
         return true;
     }
 
-    private void closeBrowser() {
+    public void closeBrowser() {
         mBrowserFrame.setBackgroundColor(mBackgroundColor);
         performExitCleanUp();
         mTabsManager.shutdown();

app/src/main/java/acr/browser/lightning/activity/IncognitoActivity.java

@@ -58,7 +58,6 @@ public class IncognitoActivity extends BrowserActivity {
     @Override
     public void closeActivity() {
         closeDrawers();
-        performExitCleanUp();
+        closeBrowser();
-        finish();
     }
 }