cefclient: Allow download with --hide-controls (fixes #3742)

The InterceptedRequestHandlerWrapper object may be deleted (likely via
~InterceptedRequest) while the task to call
InterceptedRequestHandlerWrapper:ContinueCreateURLLoaderNetworkObserver
is still pending. That binding holds a
WeakPtr<InterceptedRequestHandlerWrapper> (which is now nullptr)
resulting in the bound std::unique_ptr<PendingRequest> being deleted
while still holding a raw_ptr<network::ResourceRequest> to the
already-deleted object. This is always safe (raw_ptr will never be
dereferenced) because of the WeakPtr check.

libcef/browser/net_service/resource_request_handler_wrapper.cc

@@ -147,7 +147,7 @@ class InterceptedRequestHandlerWrapper : public InterceptedRequestHandler {
     }
 
     const int32_t id_;
-    raw_ptr<network::ResourceRequest> request_;
+    raw_ptr<network::ResourceRequest, DisableDanglingPtrDetection> request_;
     const bool request_was_redirected_;
     OnBeforeRequestResultCallback callback_;
     CancelRequestCallback cancel_callback_;

tests/cefclient/browser/client_handler.cc

@@ -822,12 +822,6 @@ bool ClientHandler::CanDownload(CefRefPtr<CefBrowser> browser,
                                 const CefString& request_method) {
   CEF_REQUIRE_UI_THREAD();
 
-  if (!with_controls_) {
-    // Block the download.
-    LOG(INFO) << "Blocking download";
-    return false;
-  }
-
   // Allow the download.
   return true;
 }