Mojo C++ bindings: remove some usage of AssociatedGroup from user code.

mojo/public/cpp/bindings/associated_binding.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_BINDING_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_BINDING_H_
 
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 89 matching lines @@
  public:
   using ImplPointerType = typename ImplRefTraits::PointerType;
 
   // Constructs an incomplete associated binding that will use the
   // implementation |impl|. It may be completed with a subsequent call to the
   // |Bind| method. Does not take ownership of |impl|, which must outlive this
   // object.
   explicit AssociatedBinding(ImplPointerType impl) { stub_.set_sink(impl); }
 
   // Constructs a completed associated binding of |impl|. The output |ptr_info|
-  // should be passed through the message pipe endpoint referred to by
-  // |associated_group| to setup the corresponding asssociated interface
-  // pointer. |impl| must outlive this object.
+  // should be sent by another interface. |impl| must outlive this object.
   AssociatedBinding(ImplPointerType impl,
                     AssociatedInterfacePtrInfo<Interface>* ptr_info,
-                    AssociatedGroup* associated_group,
+                    AssociatedGroup* associated_group = nullptr,
                     scoped_refptr<base::SingleThreadTaskRunner> runner =
                         base::ThreadTaskRunnerHandle::Get())
       : AssociatedBinding(std::move(impl)) {
     Bind(ptr_info, associated_group, std::move(runner));
   }
 
   // Constructs a completed associated binding of |impl|. |impl| must outlive
   // the binding.
   AssociatedBinding(ImplPointerType impl,
                     AssociatedInterfaceRequest<Interface> request,
                     scoped_refptr<base::SingleThreadTaskRunner> runner =
                         base::ThreadTaskRunnerHandle::Get())
       : AssociatedBinding(std::move(impl)) {
     Bind(std::move(request), std::move(runner));
   }
 
   ~AssociatedBinding() {}
 
   // Creates an associated inteface and sets up this object as the
-  // implementation side. The output |ptr_info| should be passed through the
-  // message pipe endpoint referred to by |associated_group| to setup the
-  // corresponding asssociated interface pointer.
+  // implementation side. The output |ptr_info| should be sent by another
+  // interface.
   void Bind(AssociatedInterfacePtrInfo<Interface>* ptr_info,
-            AssociatedGroup* associated_group,
+            AssociatedGroup* associated_group = nullptr,
             scoped_refptr<base::SingleThreadTaskRunner> runner =
                 base::ThreadTaskRunnerHandle::Get()) {
-    AssociatedInterfaceRequest<Interface> request;
-    associated_group->CreateAssociatedInterface(AssociatedGroup::WILL_PASS_PTR,
-                                                ptr_info, &request);
+    auto request = MakeRequest(ptr_info);
+    ptr_info->set_version(Interface::Version_);
     Bind(std::move(request), std::move(runner));
   }
 
   // Sets up this object as the implementation side of an associated interface.
   void Bind(AssociatedInterfaceRequest<Interface> request,
             scoped_refptr<base::SingleThreadTaskRunner> runner =
                 base::ThreadTaskRunnerHandle::Get()) {
     BindImpl(request.PassHandle(), &stub_,
              base::WrapUnique(new typename Interface::RequestValidator_()),
              Interface::HasSyncMethods_, std::move(runner),
@@ skipping 19 matching lines @@
 
  private:
   typename Interface::template Stub_<ImplRefTraits> stub_;
 
   DISALLOW_COPY_AND_ASSIGN(AssociatedBinding);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_BINDING_H_