Prefix string16 with base:: in ui/.

ui/metro_viewer/ime_types.h

 // Copyright 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 UI_METRO_VIEWER_IME_TYPES_H_
 #define UI_METRO_VIEWER_IME_TYPES_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 10 matching lines @@
   int32 end_offset;
   bool thick;
 };
 
 // An equivalent to ui::CompositionText defined in
 // "ui/base/ime/composition_text.h". Redefined here to avoid dependency
 // on ui.gyp from metro_driver.gyp.
 struct Composition {
   Composition();
   ~Composition();
-  string16 text;
+  base::string16 text;
   int32 selection_start;
   int32 selection_end;
   std::vector<UnderlineInfo> underlines;
 };
 
 // An equivalent to Win32 RECT structure. This can be gfx::Rect but redefined
 // here to avoid dependency on gfx.gyp from metro_driver.gyp.
 struct CharacterBounds {
   CharacterBounds();
   int32 left;
   int32 top;
   int32 right;
   int32 bottom;
 };
 
 }  // namespace metro_viewer
 
 #endif  // UI_METRO_VIEWER_IME_TYPES_H_