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

chrome/browser/extensions/extension_infobar_delegate.h

Index: chrome/browser/extensions/extension_infobar_delegate.h
diff --git a/chrome/browser/extensions/extension_infobar_delegate.h b/chrome/browser/extensions/extension_infobar_delegate.h
index ec699d9c2a08fb59525984d0657e469890f77ce1..b3e2942f9d981a4ea76c925c748b8b6856554868 100644
--- a/chrome/browser/extensions/extension_infobar_delegate.h
+++ b/chrome/browser/extensions/extension_infobar_delegate.h
@@ -45,6 +45,10 @@ class ExtensionInfoBarDelegate : public infobars::InfoBarDelegate,
   extensions::ExtensionViewHost* extension_view_host() {
     return extension_view_host_.get();
   }
+  const extensions::ExtensionViewHost* extension_view_host() const {
+    return extension_view_host_.get();
+  }
+
   int height() { return height_; }
 
   bool closing() const { return closing_; }
@@ -69,6 +73,8 @@ class ExtensionInfoBarDelegate : public infobars::InfoBarDelegate,
   virtual void InfoBarDismissed() OVERRIDE;
   virtual Type GetInfoBarType() const OVERRIDE;
   virtual ExtensionInfoBarDelegate* AsExtensionInfoBarDelegate() OVERRIDE;
+  virtual const ExtensionInfoBarDelegate*
+      AsExtensionInfoBarDelegate() const OVERRIDE;
 
   // content::NotificationObserver.
   virtual void Observe(int type,