base: Add more BASE_EXPORT macros

base/string16.h

 // Copyright (c) 2011 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 BASE_STRING16_H_
 #define BASE_STRING16_H_
 #pragma once
 
 // WHAT:
 // A version of std::basic_string that provides 2-byte characters even when
@@ skipping 146 matching lines @@
 // std::basic_string<char> (string) and std::basic_string<wchar_t> (wstring).
 //
 // This also works around a Mac OS X linker bug in ld64-85.2.1 (Xcode 3.1.2),
 // in which the linker does not fully coalesce symbols when dead code
 // stripping is enabled.  This bug causes the memory errors described above
 // to occur even when a std::basic_string<> does not cross shared library
 // boundaries, such as in statically-linked executables.
 //
 // TODO(mark): File this bug with Apple and update this note with a bug number.
 
-extern template class std::basic_string<char16, base::string16_char_traits>;
+extern template
+class BASE_EXPORT std::basic_string<char16, base::string16_char_traits>;
 
 typedef std::basic_string<char16, base::string16_char_traits> string16;
 
 namespace base {
 BASE_EXPORT extern std::ostream& operator<<(std::ostream& out,
                                             const string16& str);
 }
 
 #endif  // WCHAR_T_IS_UTF32
 
 #endif  // BASE_STRING16_H_