content: convert SSL notifications to observer usage

chrome/browser/ssl/ssl_tab_helper.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_BROWSER_SSL_SSL_TAB_HELPER_H_
 #define CHROME_BROWSER_SSL_SSL_TAB_HELPER_H_
 
 #include <map>
 
 #include "base/callback_forward.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
+#include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 class SSLAddCertHandler;
 
 namespace net {
 class HttpNetworkSession;
 class SSLCertRequestInfo;
 class X509Certificate;
 }
 
-class SSLTabHelper : public content::WebContentsUserData<SSLTabHelper> {
+class SSLTabHelper : public content::WebContentsObserver,
+                     public content::WebContentsUserData<SSLTabHelper> {
  public:
   virtual ~SSLTabHelper();
 
+  // content::WebContentsObserver:
+  virtual void DidChangeVisibleSSLState() OVERRIDE;
+
   // Called when |handler| encounters an error in verifying a received client
   // certificate. Note that, because CAs often will not send us intermediate
   // certificates, the verification we can do is minimal: we verify the
   // certificate is parseable, that we have the corresponding private key, and
   // that the certificate has not expired.
   void OnVerifyClientCertificateError(
       scoped_refptr<SSLAddCertHandler> handler, int error_code);
 
   // Called when |handler| requests the user's confirmation in adding a client
   // certificate.
@@ skipping 28 matching lines @@
 
   class SSLAddCertData;
   std::map<int, linked_ptr<SSLAddCertData> > request_id_to_add_cert_data_;
 
   SSLAddCertData* GetAddCertData(SSLAddCertHandler* handler);
 
   DISALLOW_COPY_AND_ASSIGN(SSLTabHelper);
 };
 
 #endif  // CHROME_BROWSER_SSL_SSL_TAB_HELPER_H_