Remove implicit conversions from scoped_refptr to T* in mojo/

mojo/dbus/dbus_external_service.cc

 // Copyright 2014 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/dbus/dbus_external_service.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 49 matching lines @@
 
 void DBusExternalServiceBase::ExportMethods() {
   CHECK(exported_object_);
   CHECK(exported_object_->ExportMethodAndBlock(
       kMojoDBusInterface, kMojoDBusConnectMethod,
       base::Bind(&DBusExternalServiceBase::ConnectChannel,
                  base::Unretained(this))));
 }
 
 void DBusExternalServiceBase::InitializeDBus() {
-  CHECK(!bus_);
+  CHECK(!bus_.get());
   dbus::Bus::Options options;
   options.bus_type = dbus::Bus::SESSION;
   bus_ = new dbus::Bus(options);
   CHECK(bus_->Connect());
   CHECK(bus_->SetUpAsyncOperations());
 
   exported_object_ =
       bus_->GetExportedObject(dbus::ObjectPath(kMojoDBusImplPath));
 }
 
 void DBusExternalServiceBase::TakeDBusServiceOwnership() {
   CHECK(bus_->RequestOwnershipAndBlock(
       service_name_,
       dbus::Bus::REQUIRE_PRIMARY_ALLOW_REPLACEMENT))
       << "Unable to take ownership of " << service_name_;
 }
 
 }  // namespace mojo