Clarify the strings in the external protocol dialog.

chrome/browser/ui/external_protocol_dialog_delegate.cc

 // Copyright (c) 2013 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/external_protocol_dialog_delegate.h"
 
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/strings/grit/components_strings.h"
@@ skipping 23 matching lines @@
 
 ExternalProtocolDialogDelegate::~ExternalProtocolDialogDelegate() {
 }
 
 base::string16 ExternalProtocolDialogDelegate::GetDialogButtonLabel(
     ui::DialogButton button) const {
   if (button == ui::DIALOG_BUTTON_OK) {
     return l10n_util::GetStringFUTF16(IDS_EXTERNAL_PROTOCOL_OK_BUTTON_TEXT,
                                       ElideCommandName(program_name_));
   }
-  return l10n_util::GetStringUTF16(IDS_CANCEL);
+  return l10n_util::GetStringUTF16(IDS_EXTERNAL_PROTOCOL_CANCEL_BUTTON_TEXT);
 }
 
 base::string16 ExternalProtocolDialogDelegate::GetMessageText() const {
   return base::string16();
 }
 
 base::string16 ExternalProtocolDialogDelegate::GetCheckboxText() const {
   return l10n_util::GetStringFUTF16(IDS_EXTERNAL_PROTOCOL_CHECKBOX_TEXT,
                                     ElideCommandName(program_name_));
 }
@@ skipping 14 matching lines @@
       url, render_process_host_id_, tab_contents_id_);
 }
 
 void ExternalProtocolDialogDelegate::DoCancel(const GURL& url,
                                               bool dont_block) const {
   if (dont_block) {
     ExternalProtocolHandler::SetBlockState(url.scheme(),
                                            ExternalProtocolHandler::BLOCK);
   }
 }