Move //mojo/{public, edk} underneath //third_party

mojo/public/tools/bindings/generators/cpp_templates/interface_stub_declaration.tmpl

-class {{interface.name}}Stub : public mojo::MessageReceiverWithResponder {
- public:
-  {{interface.name}}Stub();
-  void set_sink({{interface.name}}* sink) { sink_ = sink; }
-  {{interface.name}}* sink() { return sink_; }
-
-  virtual bool Accept(mojo::Message* message) override;
-  virtual bool AcceptWithResponder(mojo::Message* message,
-                                   mojo::MessageReceiver* responder) override;
-
- private:
-  {{interface.name}}* sink_;
-};