Rename TestService to EchoTestService to prevent name-conflict with
'TestService' in test.proto
diff --git a/test/cpp/end2end/async_end2end_test.cc b/test/cpp/end2end/async_end2end_test.cc
index 62023b2..3f8ed0b 100644
--- a/test/cpp/end2end/async_end2end_test.cc
+++ b/test/cpp/end2end/async_end2end_test.cc
@@ -186,7 +186,7 @@
     build_bad.AddListeningPort(server_address_.str(),
                                grpc::InsecureServerCredentials());
     build_bad.RegisterAsyncService(&service_);
-    grpc::testing::TestService::Service sync_service;
+    grpc::testing::EchoTestService::Service sync_service;
     build_bad.RegisterService(&sync_service);
     GPR_ASSERT(build_bad.BuildAndStart() == nullptr);
 
@@ -211,7 +211,7 @@
   void ResetStub() {
     std::shared_ptr<Channel> channel =
         CreateChannel(server_address_.str(), InsecureChannelCredentials());
-    stub_ = grpc::testing::TestService::NewStub(channel);
+    stub_ = grpc::testing::EchoTestService::NewStub(channel);
   }
 
   void SendRpc(int num_rpcs) {
@@ -249,9 +249,9 @@
   }
 
   std::unique_ptr<ServerCompletionQueue> cq_;
-  std::unique_ptr<grpc::testing::TestService::Stub> stub_;
+  std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_;
   std::unique_ptr<Server> server_;
-  grpc::testing::TestService::AsyncService service_;
+  grpc::testing::EchoTestService::AsyncService service_;
   std::ostringstream server_address_;
 };