Fix webrequest api for webview in webui

extensions/browser/api/web_request/web_request_api_helpers.cc

Index: extensions/browser/api/web_request/web_request_api_helpers.cc
diff --git a/extensions/browser/api/web_request/web_request_api_helpers.cc b/extensions/browser/api/web_request/web_request_api_helpers.cc
index 680a9532eef0864765dc3e0efae169d5a5aa9446..f96e8ec0fc76fd8d332f82d0ccbbcf6b7a4da0ba 100644
--- a/extensions/browser/api/web_request/web_request_api_helpers.cc
+++ b/extensions/browser/api/web_request/web_request_api_helpers.cc
@@ -1206,9 +1206,11 @@ void NotifyWebRequestAPIUsed(
 
   extensions::RuntimeData* runtime_data =
       extensions::ExtensionSystem::Get(browser_context)->runtime_data();
-  if (runtime_data->HasUsedWebRequest(extension.get()))
-    return;
-  runtime_data->SetHasUsedWebRequest(extension.get(), true);
+  if (extension) {
+    if (runtime_data->HasUsedWebRequest(extension.get()))
+      return;
+    runtime_data->SetHasUsedWebRequest(extension.get(), true);
+  }
 
   for (content::RenderProcessHost::iterator it =
            content::RenderProcessHost::AllHostsIterator();