mojo: Make InterfacePtr<> testable in if() statements without .get().

mojo/services/native_viewport/native_viewport_service.cc

 // Copyright 2013 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 "mojo/services/native_viewport/native_viewport_service.h"
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
@@ skipping 55 matching lines @@
     DCHECK(native_viewport_);
     native_viewport_->Close();
   }
 
   virtual void SetBounds(RectPtr bounds) OVERRIDE {
     native_viewport_->SetBounds(bounds.To<gfx::Rect>());
   }
 
   virtual void CreateGLES2Context(
       InterfaceRequest<CommandBuffer> command_buffer_request) OVERRIDE {
-    if (command_buffer_.get() || command_buffer_request_.is_pending()) {
+    if (command_buffer_ || command_buffer_request_.is_pending()) {
       LOG(ERROR) << "Can't create multiple contexts on a NativeViewport";
       return;
     }
     command_buffer_request_ = command_buffer_request.Pass();
     CreateCommandBufferIfNeeded();
   }
 
   void AckEvent() {
     waiting_for_event_ack_ = false;
   }
@@ skipping 87 matching lines @@
 }  // namespace mojo
 
 MOJO_NATIVE_VIEWPORT_EXPORT mojo::ApplicationImpl*
     CreateNativeViewportService(
         mojo::shell::Context* context,
         mojo::ScopedMessagePipeHandle service_provider_handle) {
   mojo::ApplicationImpl* app = new mojo::ApplicationImpl(
       new mojo::services::NVSDelegate(context), service_provider_handle.Pass());
   return app;
 }