[Chromoting] Refactored worker process launching code and speeded up the desktop process launch.

remoting/host/host_main.cc

Index: remoting/host/host_main.cc
diff --git a/remoting/host/host_main.cc b/remoting/host/host_main.cc
index 1687758bf5be1894d039bb01a16ecd04a2b37f09..3591e555e07b7991b79986f26a7c2edd30aa7426 100644
--- a/remoting/host/host_main.cc
+++ b/remoting/host/host_main.cc
@@ -125,7 +125,9 @@ int RunElevated() {
   info.nShow = SW_SHOWNORMAL;
 
   if (!ShellExecuteEx(&info)) {
-    return GetLastError();
+    DWORD exit_code = GetLastError();
+    LOG_GETLASTERROR(ERROR) << "Unable to launch '" << binary.value() << "'";
+    return exit_code;
   }
 
   return kSuccessExitCode;