Fix base::GetNativeLibraryName() for Mac.

base/native_library_mac.mm

 // 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 <mach-o/getsect.h>
 
 #include "base/files/file_path.h"
@@ skipping 100 matching lines @@
 
   // If this library hasn't been tested for having ObjC, use the function
   // pointer to look up the section information for the library.
   if (function_pointer && library->objc_status == OBJC_UNKNOWN)
     library->objc_status = GetObjCStatusForImage(function_pointer);
 
   return function_pointer;
 }
 
 // static
-string16 GetNativeLibraryName(StringPiece16 name) {
-  return name.as_string() + ASCIIToUTF16(".dylib");
+std::string GetNativeLibraryName(StringPiece name) {
+  return "lib" + name.as_string() + ".dylib";
 }
 
 }  // namespace base