[NTP Snippets] Introduce ContentSuggestion::ID

chrome/browser/ui/webui/snippets_internals_message_handler.h

 // Copyright 2016 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_UI_WEBUI_SNIPPETS_INTERNALS_MESSAGE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SNIPPETS_INTERNALS_MESSAGE_HANDLER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 23 matching lines @@
   enum class DismissedState { HIDDEN, LOADING, VISIBLE };
 
   // content::WebUIMessageHandler:
   void RegisterMessages() override;
 
   // ntp_snippets::ContentSuggestionsService::Observer:
   void OnNewSuggestions(ntp_snippets::Category category) override;
   void OnCategoryStatusChanged(
       ntp_snippets::Category category,
       ntp_snippets::CategoryStatus new_status) override;
-  void OnSuggestionInvalidated(ntp_snippets::Category category,
-                               const std::string& suggestion_id) override;
+  void OnSuggestionInvalidated(
+      const ntp_snippets::ContentSuggestion::ID& suggestion_id) override;
   void ContentSuggestionsServiceShutdown() override;
 
   void HandleRefreshContent(const base::ListValue* args);
   void HandleDownload(const base::ListValue* args);
   void HandleClearCachedSuggestions(const base::ListValue* args);
   void HandleClearDismissedSuggestions(const base::ListValue* args);
   void HandleToggleDismissedSuggestions(const base::ListValue* args);
   void ClearClassification(const base::ListValue* args);
 
   void SendAllContent();
@@ skipping 25 matching lines @@
            std::vector<ntp_snippets::ContentSuggestion>,
            ntp_snippets::Category::CompareByID>
       dismissed_suggestions_;
 
   base::WeakPtrFactory<SnippetsInternalsMessageHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SnippetsInternalsMessageHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SNIPPETS_INTERNALS_MESSAGE_HANDLER_H_