Run event executor on the ui thread to remove the need to explicitly XFlush() the XTest calls.

chrome/service/service_process.h

Index: chrome/service/service_process.h
diff --git a/chrome/service/service_process.h b/chrome/service/service_process.h
index ac3a12869cebcebc0a0fe8f14543e0a5270a75e0..8a84efd75797305572550349e5b748d9ad1eda93 100644
--- a/chrome/service/service_process.h
+++ b/chrome/service/service_process.h
@@ -34,7 +34,8 @@ class ServiceProcess : public CloudPrintProxy::Client,
   ~ServiceProcess();
 
   // Initialize the ServiceProcess with the message loop that it should run on.
-  bool Initialize(MessageLoop* message_loop, const CommandLine& command_line);
+  bool Initialize(MessageLoopForUI* message_loop,
+                  const CommandLine& command_line);
   bool Teardown();
   // TODO(sanjeevr): Change various parts of the code such as
   // net::ProxyService::CreateSystemProxyConfigService to take in