Store feedback for spellcheck results from spelling service

chrome/browser/spellchecker/feedback.h

 // 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.
 
 #ifndef CHROME_BROWSER_SPELLCHECKER_FEEDBACK_H_
 #define CHROME_BROWSER_SPELLCHECKER_FEEDBACK_H_
 
 #include <map>
+#include <set>
 #include <vector>
 
 #include "chrome/browser/spellchecker/misspelling.h"
 
 namespace spellcheck {
 
 // Stores feedback for the spelling service in |Misspelling| objects. Each
 // |Misspelling| object is identified by a |hash| and corresponds to a document
 // marker  with the same |hash| identifier in the renderer.
 class Feedback {
@@ skipping 46 matching lines @@
 
   // Removes all misspellings.
   void Clear();
 
  private:
   // A map of hashes that identify document markers to feedback data to be sent
   // to spelling service.
   std::map<uint32, Misspelling> misspellings_;
 
   // A map of renderer process ID to hashes that identify misspellings.
-  std::map<int, std::vector<uint32> > hashes_;
+  std::map<int, std::set<uint32> > hashes_;
 
   DISALLOW_COPY_AND_ASSIGN(Feedback);
 };
 
 }  // namespace spellcheck
 
 #endif  // CHROME_BROWSER_SPELLCHECKER_FEEDBACK_H_