Support native app redirects to herb.

chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabExternalNavigationTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabExternalNavigationTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabExternalNavigationTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabExternalNavigationTest.java
index 3e6788850a984d9b270912bb9aabd0531ad15a90..83051ffe081cba2afeade3494544f0ffa505b017 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabExternalNavigationTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabExternalNavigationTest.java
@@ -71,9 +71,13 @@ public class CustomTabExternalNavigationTest extends CustomTabActivityTestBase {
                 getInstrumentation().getTargetContext(), mTestServer.getURL(TEST_PATH)));
         Tab tab = getActivity().getActivityTab();
         TabDelegateFactory delegateFactory = tab.getDelegateFactory();
-        assert delegateFactory instanceof CustomTabDelegateFactory;
-        mUrlHandler = ((CustomTabDelegateFactory) delegateFactory).getExternalNavigationHandler();
-        mNavigationDelegate = ((CustomTabDelegateFactory) delegateFactory)
+        assertTrue(delegateFactory instanceof CustomTabDelegateFactory);
+        CustomTabDelegateFactory customTabDelegateFactory =
+                ((CustomTabDelegateFactory) delegateFactory);
+        mUrlHandler = customTabDelegateFactory.getExternalNavigationHandler();
+        assertTrue(customTabDelegateFactory.getExternalNavigationDelegate()
+                instanceof CustomTabNavigationDelegate);
+        mNavigationDelegate = (CustomTabNavigationDelegate) customTabDelegateFactory
                 .getExternalNavigationDelegate();
     }