views: Make view::Views::GetPreferredSize() const.

chrome/browser/ui/views/infobars/extension_infobar.cc

Index: chrome/browser/ui/views/infobars/extension_infobar.cc
diff --git a/chrome/browser/ui/views/infobars/extension_infobar.cc b/chrome/browser/ui/views/infobars/extension_infobar.cc
index c4d20d2d05c1811553be29ae8aec98f26944bc97..d9ea3c271d598715244c70f2689948f8b4b59826 100644
--- a/chrome/browser/ui/views/infobars/extension_infobar.cc
+++ b/chrome/browser/ui/views/infobars/extension_infobar.cc
@@ -169,9 +169,10 @@ void ExtensionInfoBar::ViewHierarchyChanged(
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
-int ExtensionInfoBar::ContentMinimumWidth() {
+int ExtensionInfoBar::ContentMinimumWidth() const {
   return NonExtensionViewWidth() +
-      GetDelegate()->extension_view_host()->view()->GetMinimumSize().width();
+      delegate()->AsExtensionInfoBarDelegate()->extension_view_host()->
+      view()->GetMinimumSize().width();
 }
 
 void ExtensionInfoBar::OnMenuButtonClicked(views::View* source,
@@ -222,6 +223,10 @@ ExtensionInfoBarDelegate* ExtensionInfoBar::GetDelegate() {
   return delegate()->AsExtensionInfoBarDelegate();
 }
 
+const ExtensionInfoBarDelegate* ExtensionInfoBar::GetDelegate() const {
+  return delegate()->AsExtensionInfoBarDelegate();
+}
+
 int ExtensionInfoBar::NonExtensionViewWidth() const {
   return infobar_icon_->width() + kIconHorizontalMargin;
 }