Fix base::GetNativeLibraryName() for Mac.

base/native_library_posix.cc

 // 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.
 
 #include "base/native_library.h"
 
 #include <dlfcn.h>
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 32 matching lines @@
   }
 }
 
 // static
 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
                                           StringPiece name) {
   return dlsym(library, name.data());
 }
 
 // static
-string16 GetNativeLibraryName(StringPiece16 name) {
-  return ASCIIToUTF16("lib") + name.as_string() + ASCIIToUTF16(".so");
+std::string GetNativeLibraryName(StringPiece name) {
+  return "lib" + name.as_string() + ".so";
 }
 
 }  // namespace base