Reduce boilerplate needed to configure mojo::Binding

mash/wm/accelerator_registrar_apptest.cc

 // 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.
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "components/mus/public/cpp/event_matcher.h"
@@ skipping 11 matching lines @@
 
 namespace mash {
 namespace wm {
 
 class TestAcceleratorHandler : public AcceleratorHandler {
  public:
   explicit TestAcceleratorHandler(AcceleratorRegistrarPtr registrar)
       : binding_(this),
         registrar_(std::move(registrar)),
         add_accelerator_result_(false) {
-    AcceleratorHandlerPtr handler;
-    binding_.Bind(GetProxy(&handler));
-    registrar_->SetHandler(std::move(handler));
+    registrar_->SetHandler(binding_.CreateInterfacePtrAndBind());
   }
   ~TestAcceleratorHandler() override {}
 
   // Attempts to install an accelerator with the specified id and event matcher.
   // Returns whether the accelerator could be successfully added or not.
   bool AttemptToInstallAccelerator(uint32_t accelerator_id,
                                    mus::mojom::EventMatcherPtr matcher) {
     DCHECK(!run_loop_);
     registrar_->AddAccelerator(
         accelerator_id, std::move(matcher),
@@ skipping 64 matching lines @@
   EXPECT_FALSE(handler_first.AttemptToInstallAccelerator(
       3, mus::CreateKeyMatcher(mus::mojom::KEYBOARD_CODE_N,
                                mus::mojom::EVENT_FLAGS_SHIFT_DOWN)));
   EXPECT_FALSE(handler_second.AttemptToInstallAccelerator(
       3, mus::CreateKeyMatcher(mus::mojom::KEYBOARD_CODE_N,
                                mus::mojom::EVENT_FLAGS_SHIFT_DOWN)));
 }
 
 }  // namespace wm
 }  // namespace mash