Test: Fix testFindAll result listener not set issue

Change-Id: Ic3691ffee33acf35dd4cae1c4fc046f9ab44959d
(cherry picked from commit 45392e22193e43621697e0f0cc2e3fa69142c524)
diff --git a/tests/tests/webkit/src/android/webkit/cts/WebViewTest.java b/tests/tests/webkit/src/android/webkit/cts/WebViewTest.java
index 1984698..c3fdb49 100755
--- a/tests/tests/webkit/src/android/webkit/cts/WebViewTest.java
+++ b/tests/tests/webkit/src/android/webkit/cts/WebViewTest.java
@@ -1456,6 +1456,7 @@
                 + "</body></html>", "text/html", null);
 
         WaitForFindResultsListener l = new WaitForFindResultsListener(mOnUiThread, "find", 2, true);
+        mOnUiThread.setFindListener(l);
         mOnUiThread.findAll("find");
         assertEquals(2, l.get(MIN_FIND_WAIT_MS, TimeUnit.MILLISECONDS).intValue());
     }