Added check for behavior feature existense

extensions/browser/guest_view/extensions_guest_view_manager_delegate.cc

 // Copyright 2015 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 "extensions/browser/guest_view/extensions_guest_view_manager_delegate.h"
 
 #include <utility>
 
 #include "components/guest_view/browser/guest_view_base.h"
 #include "components/guest_view/browser/guest_view_manager.h"
@@ skipping 49 matching lines @@
   EventRouter::DispatchEventToSender(owner, guest->browser_context(),
                                      guest->owner_host(), histogram_value,
                                      event_name, std::move(event_args),
                                      EventRouter::USER_GESTURE_UNKNOWN, info);
 }
 
 bool ExtensionsGuestViewManagerDelegate::IsGuestAvailableToContext(
     GuestViewBase* guest) {
   const Feature* feature =
       FeatureProvider::GetAPIFeature(guest->GetAPINamespace());
-  CHECK(feature);
+  if (!feature)
+    return false;
 
   ProcessMap* process_map = ProcessMap::Get(context_);
   CHECK(process_map);
 
   const Extension* owner_extension = ProcessManager::Get(context_)->
       GetExtensionForWebContents(guest->owner_web_contents());
 
   // Ok for |owner_extension| to be nullptr, the embedder might be WebUI.
   Feature::Availability availability = feature->IsAvailableToContext(
       owner_extension,
@@ skipping 14 matching lines @@
 void ExtensionsGuestViewManagerDelegate::RegisterAdditionalGuestViewTypes() {
   GuestViewManager* manager = GuestViewManager::FromBrowserContext(context_);
   manager->RegisterGuestViewType<AppViewGuest>();
   manager->RegisterGuestViewType<ExtensionOptionsGuest>();
   manager->RegisterGuestViewType<ExtensionViewGuest>();
   manager->RegisterGuestViewType<MimeHandlerViewGuest>();
   manager->RegisterGuestViewType<WebViewGuest>();
 }
 
 }  // namespace extensions