Remove use of search API; effectively remove support to search for task by name.

appengine/swarming/server/task_result_test.py

Index: appengine/swarming/server/task_result_test.py
diff --git a/appengine/swarming/server/task_result_test.py b/appengine/swarming/server/task_result_test.py
index b2463f70e5058ca49635e4b6e1137c13fd7f2e9a..fe01e75a1f06ebceb9fe6761d8de4e09d05f6cbd 100755
--- a/appengine/swarming/server/task_result_test.py
+++ b/appengine/swarming/server/task_result_test.py
@@ -518,10 +518,6 @@ class TaskResultApiTest(TestCase):
     with self.assertRaises(datastore_errors.BadValueError):
       task_result.PerformanceStats().put()
 
-  def test_get_tasks(self):
-    # Indirectly tested by both frontend and API.
-    pass
-
   def test_get_result_summaries_query(self):
     # Indirectly tested by API.
     pass