Move Infobars core files to the Infobars component

chrome/browser/plugins/plugin_observer.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 CHROME_BROWSER_PLUGINS_PLUGIN_OBSERVER_H_
 #define CHROME_BROWSER_PLUGINS_PLUGIN_OBSERVER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
 #include <map>
 #endif
 
 class GURL;
-class InfoBarDelegate;
 class PluginFinder;
 class PluginMetadata;
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
 class PluginInstaller;
 class PluginPlaceholderHost;
 #endif
 
 namespace content {
 class WebContents;
 }
 
+namespace infobars {
+class InfoBarDelegate;
+}
+
 class PluginObserver : public content::WebContentsObserver,
                        public content::WebContentsUserData<PluginObserver> {
  public:
   virtual ~PluginObserver();
 
   // content::WebContentsObserver implementation.
   virtual void RenderFrameCreated(
       content::RenderFrameHost* render_frame_host) OVERRIDE;
   virtual void PluginCrashed(const base::FilePath& plugin_path,
                              base::ProcessId plugin_pid) OVERRIDE;
@@ skipping 28 matching lines @@
   // Stores all PluginPlaceholderHosts, keyed by their routing ID.
   std::map<int, PluginPlaceholderHost*> plugin_placeholders_;
 #endif
 
   base::WeakPtrFactory<PluginObserver> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginObserver);
 };
 
 #endif  // CHROME_BROWSER_PLUGINS_PLUGIN_OBSERVER_H_