Give the ChromeVox Panel an extension view type.

chrome/browser/chromeos/login/ui/webui_login_view.cc

Index: chrome/browser/chromeos/login/ui/webui_login_view.cc
diff --git a/chrome/browser/chromeos/login/ui/webui_login_view.cc b/chrome/browser/chromeos/login/ui/webui_login_view.cc
index 72d23d1caed7b575df0afbeba46d0de2ed1da83b..b4acbd58deffcf24957f8c046ebcf36225e835cd 100644
--- a/chrome/browser/chromeos/login/ui/webui_login_view.cc
+++ b/chrome/browser/chromeos/login/ui/webui_login_view.cc
@@ -41,6 +41,7 @@
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/common/renderer_preferences.h"
+#include "extensions/browser/view_type_utils.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
@@ -196,6 +197,7 @@ void WebUILoginView::Init() {
       SetDelegate(this);
 
   web_contents->SetDelegate(this);
+  extensions::SetViewType(web_contents, extensions::VIEW_TYPE_COMPONENT);
   extensions::ChromeExtensionWebContentsObserver::CreateForWebContents(
       web_contents);
   content::RendererPreferences* prefs = web_contents->GetMutableRendererPrefs();