views: Add a new ctor to MessageBoxView that takes only a InitParams.

chrome/browser/chromeos/external_protocol_dialog.cc

Index: chrome/browser/chromeos/external_protocol_dialog.cc
diff --git a/chrome/browser/chromeos/external_protocol_dialog.cc b/chrome/browser/chromeos/external_protocol_dialog.cc
index 21399d442f74d3344363e0d675a2684d6a2dee24..d8417ae5cf767211947ba30a6d32c6134eb967c1 100644
--- a/chrome/browser/chromeos/external_protocol_dialog.cc
+++ b/chrome/browser/chromeos/external_protocol_dialog.cc
@@ -98,16 +98,12 @@ ExternalProtocolDialog::ExternalProtocolDialog(WebContents* web_contents,
   ui::ElideString(ASCIIToUTF16(url.possibly_invalid_spec()),
       kMaxUrlWithoutSchemeSize, &elided_url_without_scheme);
 
-  string16 message_text = l10n_util::GetStringFUTF16(
-      IDS_EXTERNAL_PROTOCOL_INFORMATION,
+  views::MessageBoxView::InitParams params(
+      l10n_util::GetStringFUTF16(IDS_EXTERNAL_PROTOCOL_INFORMATION,
       ASCIIToUTF16(url.scheme() + ":"),
-      elided_url_without_scheme) + ASCIIToUTF16("\n\n");
-
-  message_box_view_ = new views::MessageBoxView(
-      views::MessageBoxView::NO_OPTIONS,
-      message_text,
-      string16(),
-      kMessageWidth);
+      elided_url_without_scheme) + ASCIIToUTF16("\n\n"));
+  params.message_width = kMessageWidth;
+  message_box_view_ = new views::MessageBoxView(params);
   message_box_view_->SetCheckBoxLabel(
       l10n_util::GetStringUTF16(IDS_EXTERNAL_PROTOCOL_CHECKBOX_TEXT));