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

mojo/shell/public/cpp/lib/application_runner.cc

Index: mojo/shell/public/cpp/lib/application_runner.cc
diff --git a/mojo/shell/public/cpp/lib/application_runner.cc b/mojo/shell/public/cpp/lib/application_runner.cc
index dd9be48f3401c27be453e4fbb5a433ae44140044..3a358608c2a5b759f4e4ef65cc52d699fd3623a9 100644
--- a/mojo/shell/public/cpp/lib/application_runner.cc
+++ b/mojo/shell/public/cpp/lib/application_runner.cc
@@ -9,6 +9,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/process/launch.h"
+#include "mojo/message_pump/message_pump_mojo.h"
 #include "mojo/shell/public/cpp/shell_client.h"
 #include "mojo/shell/public/cpp/shell_connection.h"
 
@@ -19,7 +20,7 @@
 
 ApplicationRunner::ApplicationRunner(ShellClient* client)
     : client_(scoped_ptr<ShellClient>(client)),
-      message_loop_type_(base::MessageLoop::TYPE_DEFAULT),
+      message_loop_type_(base::MessageLoop::TYPE_CUSTOM),
       has_run_(false) {}
 
 ApplicationRunner::~ApplicationRunner() {}
@@ -48,7 +49,10 @@
 
   {
     scoped_ptr<base::MessageLoop> loop;
-    loop.reset(new base::MessageLoop(message_loop_type_));
+    if (message_loop_type_ == base::MessageLoop::TYPE_CUSTOM)
+      loop.reset(new base::MessageLoop(common::MessagePumpMojo::Create()));
+    else
+      loop.reset(new base::MessageLoop(message_loop_type_));
 
     connection_.reset(new ShellConnection(
         client_.get(),