o Cleans up canonical extension_install_ui.cc to avoid #ifdefs when feasible....

chrome/browser/extensions/extension_install_ui.h

 // Copyright (c) 2009 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_EXTENSIONS_EXTENSION_INSTALL_UI_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_UI_H_
 
 #include "app/gfx/native_widget_types.h"
 #include "base/file_path.h"
 #include "base/ref_counted.h"
 
 #include <string>
 
 class Extension;
 class ExtensionsService;
 class MessageLoop;
 class Profile;
+class InfoBarDelegate;
 class SandboxedExtensionUnpacker;
 class SkBitmap;
+class TabContents;
 
 // Displays all the UI around extension installation.
 class ExtensionInstallUI {
  public:
   class Delegate {
    public:
     // We call this method after ConfirmInstall() to signal that the
     // installation should continue.
     virtual void ContinueInstall() = 0;
 
     // We call this method after ConfirmInstall() to signal that the
     // installation should stop.
     virtual void AbortInstall() = 0;
   };
 
-  // NOTE: The implementation of this is platform-specific.
+  // NOTE: The implementations of these functions are platform-specific.
   static void ShowExtensionInstallPrompt(Profile* profile,
                                          Delegate* delegate,
                                          Extension* extension,
                                          SkBitmap* install_icon,
                                          const std::wstring& warning_text);
+  static void ShowExtensionInstallError(const std::string& error);
 
   ExtensionInstallUI(Profile* profile);
 
   // This is called by the installer to verify whether the installation should
   // proceed.
   //
   // We *MUST* eventually call either ContinueInstall() or AbortInstall()
   // on |delegate|.
   void ConfirmInstall(Delegate* delegate, Extension* extension,
                       SkBitmap* icon);
 
   // Installation was successful.
   void OnInstallSuccess(Extension* extension);
 
   // Intallation failed.
   void OnInstallFailure(const std::string& error);
 
   // The install was rejected because the same extension/version is already
   // installed.
   void OnOverinstallAttempted(Extension* extension);
 
  private:
+  // When a Theme is downloaded it is applied and an info bar is shown to give
+  // the user a choice to keep it or undo the installation.
   void ShowThemeInfoBar(Extension* new_theme);
 
+  // Returns the delegate to control the browser's info bar. This is within its
+  // own function due to its platform-specific nature.
+  InfoBarDelegate* GetNewInfoBarDelegate(Extension* new_theme,
+                                         TabContents* tab_contents);
+
   Profile* profile_;
   MessageLoop* ui_loop_;
   std::string previous_theme_id_;  // Used to undo theme installation.
 
 #if defined(TOOLKIT_GTK)
   // Also needed to undo theme installation in the linux UI.
   bool previous_use_gtk_theme_;
 #endif
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_UI_H_