Re-implement the screensaver to use WebView instead of ExtensionDialogHost.

chrome/browser/ui/views/ash/chrome_shell_delegate.cc

 // 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.
 
 #include "chrome/browser/ui/views/ash/chrome_shell_delegate.h"
 
 #include "ash/launcher/launcher_types.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/wm/partial_screenshot_view.h"
 #include "ash/wm/window_util.h"
@@ skipping 168 matching lines @@
         content::OpenURLParams(GURL(chrome::kChromeUIMobileSetupURL),
                                content::Referrer(),
                                NEW_FOREGROUND_TAB,
                                content::PAGE_TRANSITION_LINK,
                                false));
     browser->window()->Activate();
   }
 #endif
 }
 
+content::BrowserContext* ChromeShellDelegate::GetCurrentBrowserContext() {
+  return ProfileManager::GetDefaultProfile();
+}
+
 ash::AppListViewDelegate*
     ChromeShellDelegate::CreateAppListViewDelegate() {
   // Shell will own the created delegate.
   return new AppListViewDelegate;
 }
 
 void ChromeShellDelegate::StartPartialScreenshot(
     ash::ScreenshotDelegate* screenshot_delegate) {
   ash::PartialScreenshotView::StartPartialScreenshot(screenshot_delegate);
 }
@@ skipping 31 matching lines @@
       ash::Shell::GetInstance()->CreateLauncher();
       break;
     default:
       NOTREACHED() << "Unexpected notification " << type;
   }
 #else
   // MSVC++ warns about switch statements without any cases.
   NOTREACHED() << "Unexpected notification " << type;
 #endif
 }