Use a direct include of strings headers in base/.

base/native_library.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_NATIVE_LIBRARY_H_
 #define BASE_NATIVE_LIBRARY_H_
 
 // This file defines a cross-platform "NativeLibrary" type which represents
 // a loadable module.
 
 #include "base/base_export.h"
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_MACOSX)
 #import <CoreFoundation/CoreFoundation.h>
 #endif  // OS_*
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 
 // Macro useful for writing cross-platform function pointers.
 #if defined(OS_WIN) && !defined(CDECL)
 #define CDECL __cdecl
 #else
 #define CDECL
 #endif
 
 namespace base {
 
@@ skipping 51 matching lines @@
 
 // Returns the full platform specific name for a native library.
 // For example:
 // "mylib" returns "mylib.dll" on Windows, "libmylib.so" on Linux,
 // "mylib.dylib" on Mac.
 BASE_EXPORT string16 GetNativeLibraryName(const string16& name);
 
 }  // namespace base
 
 #endif  // BASE_NATIVE_LIBRARY_H_