Move PluginLoaderClient to PluginLoaderPosix in its own file.

content/browser/plugin_loader_posix.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 CONTENT_BROWSER_PLUGIN_LOADER_POSIX_H_
+#define CONTENT_BROWSER_PLUGIN_LOADER_POSIX_H_
+
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "content/browser/plugin_service.h"
+#include "content/browser/utility_process_host.h"
+#include "webkit/plugins/webplugininfo.h"
+
+namespace base {
+class MessageLoopProxy;
+}
+
+class PluginLoaderPosix : public UtilityProcessHost::Client {
+ public:
+  // Must be called on the IO thread.
+  static void LoadPlugins(base::MessageLoopProxy* target_loop,
+                          const PluginService::GetPluginsCallback& callback);
+
+  // UtilityProcessHost::Client:
+  virtual void OnProcessCrashed(int exit_code) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+ private:
+  PluginLoaderPosix(base::MessageLoopProxy* target_loop,
+                    const PluginService::GetPluginsCallback& callback);
+  virtual ~PluginLoaderPosix();
+
+  void OnGotPlugins(const std::vector<webkit::WebPluginInfo>& plugins);
+
+  // The callback and message loop on which the callback will be run when the
+  // plugin loading process has been completed.
+  scoped_refptr<base::MessageLoopProxy> target_loop_;
+  PluginService::GetPluginsCallback callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(PluginLoaderPosix);
+};
+
+#endif  // CONTENT_BROWSER_PLUGIN_LOADER_POSIX_H_