Migrate CandidateWindow::Entry to string16.

ui/base/ime/candidate_window.h

 // Copyright 2014 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 UI_BASE_IME_CANDIDATE_WINDOW_H_
 #define UI_BASE_IME_CANDIDATE_WINDOW_H_
 
 #include <string>
 #include <vector>
 #include "base/basictypes.h"
@@ skipping 23 matching lines @@
     // Auxiliary text is typically displayed in the footer of the candidate
     // window.
     std::string auxiliary_text;
     bool is_auxiliary_text_visible;
   };
 
   // Represents a candidate entry.
   struct UI_BASE_EXPORT Entry {
     Entry();
     virtual ~Entry();
-    std::string value;
-    std::string label;
-    std::string annotation;
-    std::string description_title;
-    std::string description_body;
+    base::string16 value;
+    base::string16 label;
+    base::string16 annotation;
+    base::string16 description_title;
+    base::string16 description_body;
   };
 
   CandidateWindow();
   virtual ~CandidateWindow();
 
   // Returns true if the given |candidate_window| is equal to myself.
   bool IsEqual(const CandidateWindow& candidate_window) const;
 
   // Copies |candidate_window| to myself.
   void CopyFrom(const CandidateWindow& candidate_window);
@@ skipping 63 matching lines @@
  private:
   scoped_ptr<CandidateWindowProperty> property_;
   std::vector<Entry> candidates_;
 
   DISALLOW_COPY_AND_ASSIGN(CandidateWindow);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_CANDIDATE_WINDOW_H_