[Web Payments] Respect Harmony dialog width in Payment Request

chrome/browser/ui/views/payments/payment_request_dialog_view.cc

 // Copyright 2016 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 "chrome/browser/ui/views/payments/payment_request_dialog_view.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 314 matching lines @@
 
   layout->StartRow(0.5, 1);
   layout->AddView(new views::Label(
       l10n_util::GetStringUTF16(IDS_PAYMENTS_PROCESSING_MESSAGE)));
 
   throbber_overlay_.SetLayoutManager(layout.release());
   AddChildView(&throbber_overlay_);
 }
 
 gfx::Size PaymentRequestDialogView::GetPreferredSize() const {
-  return gfx::Size(kDialogWidth, kDialogHeight);
+  return gfx::Size(GetActualDialogWidth(), kDialogHeight);
 }
 
 void PaymentRequestDialogView::ViewHierarchyChanged(
     const ViewHierarchyChangedDetails& details) {
   if (being_closed_)
     return;
 
   // When a view that is associated with a controller is removed from this
   // view's descendants, dispose of the controller.
   if (!details.is_add &&
       controller_map_.find(details.child) != controller_map_.end()) {
     DCHECK(!details.move_view);
     controller_map_.erase(details.child);
   }
 }
 
 }  // namespace payments