Switch PrintViewManager, PrintPreviewMessageHandler to use WebContentsUserData.

chrome/common/chrome_notification_types.h

 // 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.
 
 #ifndef CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_
 #define CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_
 
 #include "build/build_config.h"
 #include "content/public/browser/notification_types.h"
 
@@ skipping 1228 matching lines @@
   NOTIFICATION_BROWSING_DATA_REMOVED,
 
   // The user accepted or dismissed a SSL client authentication request.
   // The source is a Source<net::HttpNetworkSession>.  Details is a
   // (std::pair<net::SSLCertRequestInfo*, net::X509Certificate*>).
   NOTIFICATION_SSL_CLIENT_AUTH_CERT_SELECTED,
 
   // Blocked content.
   // Sent when content changes to or from the blocked state in
   // BlockedContentTabHelper.
-  // The source is the TabContents of the blocked content and details
+  // The source is the WebContents of the blocked content and details
   // is a boolean: true if the content is entering the blocked state, false
   // if it is leaving.
   NOTIFICATION_CONTENT_BLOCKED_STATE_CHANGED,
 
   // SearchViewController.
   // Sent when animations initiated by search view controller complete.
   // The source is the SearchViewController whose animation is finished.
   // No details.
   NOTIFICATION_SEARCH_VIEW_CONTROLLER_ANIMATION_FINISHED,
 
   // Note:-
   // Currently only Content and Chrome define and use notifications.
   // Custom notifications not belonging to Content and Chrome should start
   // from here.
   NOTIFICATION_CHROME_END,
 };
 
 }  // namespace chrome
 
 
 #endif  // CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_