[Garbled Text][Infobar] Adding infobar to suggest turning on encoding detection.

chrome/browser/infobars/infobar_delegate.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/infobars/infobar_delegate.h"
 
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "chrome/browser/infobars/infobar_tab_helper.h"
 #include "content/public/browser/navigation_controller.h"
@@ skipping 36 matching lines @@
 }
 
 ConfirmInfoBarDelegate* InfoBarDelegate::AsConfirmInfoBarDelegate() {
   return NULL;
 }
 
 ExtensionInfoBarDelegate* InfoBarDelegate::AsExtensionInfoBarDelegate() {
   return NULL;
 }
 
+GarbledTextInfoBarDelegate* InfoBarDelegate::AsGarbledTextInfoBarDelegate() {
+  return NULL;
+}
+
 InsecureContentInfoBarDelegate*
     InfoBarDelegate::AsInsecureContentInfoBarDelegate() {
   return NULL;
 }
 
 LinkInfoBarDelegate* InfoBarDelegate::AsLinkInfoBarDelegate() {
   return NULL;
 }
 
 PluginInstallerInfoBarDelegate*
@@ skipping 34 matching lines @@
   return (contents_unique_id_ != details.entry->GetUniqueID()) ||
       (content::PageTransitionStripQualifier(
           details.entry->GetTransitionType()) ==
               content::PAGE_TRANSITION_RELOAD);
 }
 
 void InfoBarDelegate::RemoveSelf() {
   if (owner_)
     owner_->RemoveInfoBar(this);  // Clears |owner_|.
 }