Make args() accessors const

mojo/public/cpp/application/application_impl.h

Index: mojo/public/cpp/application/application_impl.h
diff --git a/mojo/public/cpp/application/application_impl.h b/mojo/public/cpp/application/application_impl.h
index bc3660306a205e87feca22daabe5ea615e07ae33..b3e02f5c55e26af52e093ce6da0fa6ba10664739 100644
--- a/mojo/public/cpp/application/application_impl.h
+++ b/mojo/public/cpp/application/application_impl.h
@@ -60,7 +60,7 @@ class ApplicationImpl : public InterfaceImpl<Application> {
   Shell* shell() const { return shell_.get(); }
 
   // Returns any initial configuration arguments, passed by the Shell.
-  const std::vector<std::string>& args() { return args_; }
+  const std::vector<std::string>& args() const { return args_; }
 
   // Establishes a new connection to an application. Caller does not own.
   ApplicationConnection* ConnectToApplication(const String& application_url);