Add FilePath to base namespace.

chrome/common/spellcheck_common.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_COMMON_SPELLCHECK_COMMON_H_
 #define CHROME_COMMON_SPELLCHECK_COMMON_H_
 
 #include <string>
 #include <vector>
 
+namespace base {
 class FilePath;
+}
 
 namespace chrome {
 namespace spellcheck_common {
 
 // Max number of dictionary suggestions.
 static const int kMaxSuggestions = 5;
 
 static const int kMaxAutoCorrectWordSize = 8;
 
 // Maximum number of words in the custom spellcheck dictionary that can be
 // synced.
 static const size_t MAX_SYNCABLE_DICTIONARY_WORDS = 1300;
 
 // Maximum number of bytes in a word that can be added to the custom spellcheck
 // dictionary.
 static const size_t MAX_CUSTOM_DICTIONARY_WORD_BYTES = 99;
 
 typedef std::vector<std::string> WordList;
 
-FilePath GetVersionedFileName(const std::string& input_language,
-                              const FilePath& dict_dir);
+base::FilePath GetVersionedFileName(const std::string& input_language,
+                                    const base::FilePath& dict_dir);
 
 std::string GetCorrespondingSpellCheckLanguage(const std::string& language);
 
 // Get SpellChecker supported languages.
 void SpellCheckLanguages(std::vector<std::string>* languages);
 
 }  // namespace spellcheck_common
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_SPELLCHECK_COMMON_H_