Revert 239759 "The comment in base64.h implies that base::Base64..."

trunk/src/chrome/browser/ui/certificate_dialogs.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/certificate_dialogs.h"
 
 
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 31 matching lines @@
   std::string result;
   for (size_t i = 0; i < str.size(); i += 64) {
     result.append(str, i, 64);  // Append clamps the len arg internally.
     result.append("\r\n");
   }
   return result;
 }
 
 std::string GetBase64String(net::X509Certificate::OSCertHandle cert) {
   std::string base64;
-  base::Base64Encode(x509_certificate_model::GetDerString(cert), &base64);
+  if (!base::Base64Encode(
+      x509_certificate_model::GetDerString(cert), &base64)) {
+    LOG(ERROR) << "base64 encoding error";
+    return std::string();
+  }
   return "-----BEGIN CERTIFICATE-----\r\n" +
       WrapAt64(base64) +
       "-----END CERTIFICATE-----\r\n";
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // General utility functions.
 
 class Exporter : public ui::SelectFileDialog::Listener {
  public:
@@ skipping 109 matching lines @@
       1,  // 1-based index for |file_type_info.extensions| to specify default.
       FILE_PATH_LITERAL("crt"),
       parent, params);
 }
 
 void ShowCertExportDialog(WebContents* web_contents,
                           gfx::NativeWindow parent,
                           net::X509Certificate::OSCertHandle cert) {
   new Exporter(web_contents, parent, cert);
 }