Clean up some nits in base::NativeLibrary.

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 <string>
 
 #include "base/base_export.h"
-#include "base/compiler_specific.h"
 #include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_MACOSX)
 #import <CoreFoundation/CoreFoundation.h>
 #endif  // OS_*
 
 namespace base {
 
 class FilePath;
 
 #if defined(OS_WIN)
-typedef HMODULE NativeLibrary;
+using NativeLibrary = HMODULE;
 #elif defined(OS_MACOSX)
 enum NativeLibraryType {
   BUNDLE,
   DYNAMIC_LIB
 };
 enum NativeLibraryObjCStatus {
   OBJC_UNKNOWN,
   OBJC_PRESENT,
   OBJC_NOT_PRESENT,
 };
 struct NativeLibraryStruct {
   NativeLibraryType type;
   CFBundleRefNum bundle_resource_ref;
   NativeLibraryObjCStatus objc_status;
   union {
     CFBundleRef bundle;
     void* dylib;
   };
 };
-typedef NativeLibraryStruct* NativeLibrary;
+using NativeLibrary = NativeLibraryStruct*;
 #elif defined(OS_POSIX)
-typedef void* NativeLibrary;
+using NativeLibrary = void*;
 #endif  // OS_*
 
 struct BASE_EXPORT NativeLibraryLoadError {
 #if defined(OS_WIN)
   NativeLibraryLoadError() : code(0) {}
 #endif  // OS_WIN
 
   // Returns a string representation of the load error.
   std::string ToString() const;
 
@@ skipping 18 matching lines @@
 // import table.
 BASE_EXPORT NativeLibrary LoadNativeLibraryDynamically(
     const FilePath& library_path);
 #endif  // OS_WIN
 
 // Unloads a native library.
 BASE_EXPORT void UnloadNativeLibrary(NativeLibrary library);
 
 // Gets a function pointer from a native library.
 BASE_EXPORT void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
-                                                      const char* name);
+                                                      StringPiece name);
 
 // 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);
+BASE_EXPORT string16 GetNativeLibraryName(StringPiece16 name);
 
 }  // namespace base
 
 #endif  // BASE_NATIVE_LIBRARY_H_