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

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

Index: chrome/browser/ui/views/ash/chrome_shell_delegate.cc
diff --git a/chrome/browser/ui/views/ash/chrome_shell_delegate.cc b/chrome/browser/ui/views/ash/chrome_shell_delegate.cc
index 368d7981a135db1b5955f0d4b5efdc1996df9cc1..3e2962189f5a4c6bc918408669c9ea23867b7319 100644
--- a/chrome/browser/ui/views/ash/chrome_shell_delegate.cc
+++ b/chrome/browser/ui/views/ash/chrome_shell_delegate.cc
@@ -186,6 +186,10 @@ void ChromeShellDelegate::OpenMobileSetup() {
 #endif
 }
 
+content::BrowserContext* ChromeShellDelegate::GetCurrentBrowserContext() {
+  return ProfileManager::GetDefaultProfile();
+}
+
 ash::AppListViewDelegate*
     ChromeShellDelegate::CreateAppListViewDelegate() {
   // Shell will own the created delegate.