Revert of [mojo-bindings] Use Watch API instead of MessagePumpMojo

mojo/shell/tests/connect/connect_test_app.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
@@ skipping 92 matching lines @@
     scoped_ptr<Connection> connection =
         connector_->Connect("mojo:connect_test_a");
     connection->SetRemoteInterfaceProviderConnectionErrorHandler(
         base::Bind(&ConnectTestApp::OnConnectionBlocked,
                    base::Unretained(this), callback, &run_loop));
     test::mojom::ConnectTestServicePtr test_service;
     connection->GetInterface(&test_service);
     test_service->GetTitle(
         base::Bind(&ConnectTestApp::OnGotTitle, base::Unretained(this),
                    callback, &run_loop));
-    {
-      // This message is dispatched as a task on the same run loop, so we need
-      // to allow nesting in order to pump additional signals.
-      base::MessageLoop::ScopedNestableTaskAllower allow(
-          base::MessageLoop::current());
-      run_loop.Run();
-    }
+    run_loop.Run();
   }
 
   // test::mojom::BlockedInterface:
   void GetTitleBlocked(const GetTitleBlockedCallback& callback) override {
     callback.Run("Called Blocked Interface!");
   }
 
   void OnConnectionBlocked(
       const ConnectToAllowedAppInBlockedPackageCallback& callback,
       base::RunLoop* run_loop) {
@@ skipping 28 matching lines @@
 
 }  // namespace shell
 }  // namespace mojo
 
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   MojoResult rv = mojo::ApplicationRunner(
       new mojo::shell::ConnectTestApp).Run(shell_handle);
   return rv;
 }