Remove android_library_loader_hook from content API

content/app/android/library_loader_hooks.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_APP_ANDROID_LIBRARY_LOADER_HOOKS_H_
-#define CONTENT_PUBLIC_APP_ANDROID_LIBRARY_LOADER_HOOKS_H_
+#ifndef CONTENT_APP_ANDROID_LIBRARY_LOADER_HOOKS_H_
+#define CONTENT_APP_ANDROID_LIBRARY_LOADER_HOOKS_H_
 
 #include <jni.h>
 
 #include "base/basictypes.h"
-#include "content/common/content_export.h"
 
 namespace content {
 
 // Register all content JNI functions now, rather than waiting for the process
 // of fully loading the native library to complete.
-CONTENT_EXPORT bool EnsureJniRegistered(JNIEnv* env);
+bool EnsureJniRegistered(JNIEnv* env);
 
 // Do the intialization of content needed immediately after the native library
 // has loaded.
 // This is designed to be used as a hook function to be passed to
 // base::android::SetLibraryLoadedHook
-CONTENT_EXPORT bool LibraryLoaded(JNIEnv* env,
-                                  jclass clazz);
+bool LibraryLoaded(JNIEnv* env, jclass clazz);
 
 }  // namespace content
 
-#endif  // CONTENT_PUBLIC_APP_ANDROID_LIBRARY_LOADER_HOOKS_H_
+#endif  // CONTENT_APP_ANDROID_LIBRARY_LOADER_HOOKS_H_