Fix webrequest api for webview in webui

extensions/browser/extension_function_dispatcher.cc

Index: extensions/browser/extension_function_dispatcher.cc
diff --git a/extensions/browser/extension_function_dispatcher.cc b/extensions/browser/extension_function_dispatcher.cc
index f9bbec561b911df0eadb21606c01769ed0b4916f..5edb3ecd41da0fbcd4c673fe48c502b9a7396bbe 100644
--- a/extensions/browser/extension_function_dispatcher.cc
+++ b/extensions/browser/extension_function_dispatcher.cc
@@ -229,8 +229,6 @@ void ExtensionFunctionDispatcher::DispatchOnIOThread(
     const ExtensionHostMsg_Request_Params& params) {
   const Extension* extension =
       extension_info_map->extensions().GetByID(params.extension_id);
-  if (!extension)
-    return;
 
   ExtensionFunction::ResponseCallback callback(
       base::Bind(&IOThreadResponseCallback, ipc_sender, routing_id,
@@ -255,12 +253,21 @@ void ExtensionFunctionDispatcher::DispatchOnIOThread(
   }
   function_io->set_ipc_sender(ipc_sender, routing_id);
   function_io->set_extension_info_map(extension_info_map);
-  function->set_include_incognito(
-      extension_info_map->IsIncognitoEnabled(extension->id()));
+  if (extension) {
+    function->set_include_incognito(
+        extension_info_map->IsIncognitoEnabled(extension->id()));
+  }
 
   if (!CheckPermissions(function.get(), params, callback))
     return;
 
+  if (!extension) {
+    // Skip all of the UMA, quota, event page, activity logging stuff if there
+    // isn't an extension, e.g. if the function call was from WebUI.
+    function->Run()->Execute();
+    return;
+  }
+
   QuotaService* quota = extension_info_map->GetQuotaService();
   std::string violation_error = quota->Assess(extension->id(),
                                               function.get(),