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

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

 // Copyright (c) 2012 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/infobars/extension_infobar.h"
 
 #include "chrome/browser/extensions/extension_context_menu_model.h"
 #include "chrome/browser/extensions/extension_infobar_delegate.h"
 #include "chrome/browser/extensions/extension_view_host.h"
 #include "chrome/browser/extensions/image_loader.h"
@@ skipping 151 matching lines @@
   extensions::ImageLoader* loader =
       extensions::ImageLoader::Get(extension_view_host->browser_context());
   loader->LoadImageAsync(
       extension,
       icon_resource,
       gfx::Size(image_size, image_size),
       base::Bind(&ExtensionInfoBar::OnImageLoaded,
                  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,
                                            const gfx::Point& point) {
   if (!owner())
     return;  // We're closing; don't call anything, it might access the owner.
   const extensions::Extension* extension =
       GetDelegate()->extension_view_host()->extension();
   DCHECK(icon_as_menu_);
 
@@ skipping 30 matching lines @@
   infobar_icon_->SizeToPreferredSize();
   infobar_icon_->SetVisible(true);
 
   Layout();
 }
 
 ExtensionInfoBarDelegate* ExtensionInfoBar::GetDelegate() {
   return delegate()->AsExtensionInfoBarDelegate();
 }
 
+const ExtensionInfoBarDelegate* ExtensionInfoBar::GetDelegate() const {
+  return delegate()->AsExtensionInfoBarDelegate();
+}
+
 int ExtensionInfoBar::NonExtensionViewWidth() const {
   return infobar_icon_->width() + kIconHorizontalMargin;
 }