[Extensions] Remove the Infobar API

extensions/browser/extension_host.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_EXTENSION_HOST_H_
 #define EXTENSIONS_BROWSER_EXTENSION_HOST_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 119 matching lines @@
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
  protected:
   content::NotificationRegistrar* registrar() { return &registrar_; }
 
   // Called after the extension page finishes loading but before the
   // EXTENSION_HOST_DID_STOP_LOADING notification is sent.
   virtual void OnDidStopLoading();
 
-  // Called once when the document first becomes available.
-  virtual void OnDocumentAvailable();
-
   // Navigates to the initial page.
   virtual void LoadInitialURL();
 
   // Returns true if we're hosting a background page.
   virtual bool IsBackgroundPage() const;
 
  private:
   friend class ProcessCreationQueue;
 
   // Actually create the RenderView for this host. See CreateRenderViewSoon.
@@ skipping 48 matching lines @@
   scoped_ptr<base::ElapsedTimer> load_start_;
 
   ObserverList<ExtensionHostObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_HOST_H_