Remove duplicate words from custom spelling dictionary on load

chrome/browser/spellchecker/spellcheck_custom_dictionary.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_SPELLCHECKER_SPELLCHECK_CUSTOM_DICTIONARY_H_
 #define CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_CUSTOM_DICTIONARY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 14 matching lines @@
   };
 
   explicit SpellcheckCustomDictionary(Profile* profile);
   virtual ~SpellcheckCustomDictionary();
 
   // Overridden from SpellcheckDictionary:
   virtual void Load() OVERRIDE;
 
   const chrome::spellcheck_common::WordList& GetWords() const;
 
+  // Populates the |custom_words| with the list of words in the custom
+  // dictionary file. Makes sure that the custom dictionary file is sorted and
+  // does not have duplicates.
   void LoadDictionaryIntoCustomWordList(
       chrome::spellcheck_common::WordList* custom_words);
 
   // Moves the words from the |custom_words| argument into its own private
   // member variable. Does not delete the memory at |custom_words|.
   void SetCustomWordList(chrome::spellcheck_common::WordList* custom_words);
 
   // Adds the given word to the custom words list and inform renderer of the
   // update. Returns false for duplicate words.
   bool AddWord(const std::string& word);
 
   // Returns false for duplicate words.
   bool CustomWordAddedLocally(const std::string& word);
 
   void WriteWordToCustomDictionary(const std::string& word);
 
-  // Removes the given word from the custom words list and inform renderer of
+  // Removes the given word from the custom words list and informs renderer of
   // the update. Returns false for words that are not in the dictionary.
   bool RemoveWord(const std::string& word);
 
   // Returns false for words that are not in the dictionary.
   bool CustomWordRemovedLocally(const std::string& word);
 
   void EraseWordFromCustomDictionary(const std::string& word);
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
@@ skipping 17 matching lines @@
   FilePath custom_dictionary_path_;
 
   base::WeakPtrFactory<SpellcheckCustomDictionary> weak_ptr_factory_;
 
   std::vector<Observer*> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellcheckCustomDictionary);
 };
 
 #endif  // CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_CUSTOM_DICTIONARY_H_