Switch GlobalErrorBubbleView to a BubbleDialogDelegate.

ui/views/window/dialog_delegate.cc

Index: ui/views/window/dialog_delegate.cc
diff --git a/ui/views/window/dialog_delegate.cc b/ui/views/window/dialog_delegate.cc
index 6152071f8e06a1eda5de24bcb7ba88f860b1ae9b..b5c4dd64e68a12b014aa47623b7c0b837a975a8e 100644
--- a/ui/views/window/dialog_delegate.cc
+++ b/ui/views/window/dialog_delegate.cc
@@ -113,6 +113,12 @@ bool DialogDelegate::Close() {
   return Accept();
 }
 
+void DialogDelegate::UpdateButton(LabelButton* button, ui::DialogButton type) {
+  button->SetText(GetDialogButtonLabel(type));
+  button->SetEnabled(IsDialogButtonEnabled(type));
+  button->SetIsDefault(type == GetDefaultDialogButton());
+}
+
 base::string16 DialogDelegate::GetDialogTitle() const {
   return GetWindowTitle();
 }