Update to Chromium version 88.0.4324.0 (#827102)

- Mac: Xcode 12.2 and the MacOS 11.0 SDK are now required for building.
- MacOS 10.10 (Yosemite) is no longer supported (see https://crbug.com/1126056).
- Flash is no longer supported (see https://www.chromium.org/flash-roadmap).

libcef/browser/extensions/api/tabs/tabs_api.cc

@@ -91,8 +91,10 @@ ExtensionFunction::ResponseAction TabsCreateFunction::Run() {
     return RespondNow(Error(error));
 
   // Return data about the newly created tab.
-  return RespondNow(has_callback() ? OneArgument(std::move(result))
-                                   : NoArguments());
+  return RespondNow(
+      has_callback()
+          ? OneArgument(base::Value::FromUniquePtrValue(std::move(result)))
+          : NoArguments());
 }
 
 ExecuteCodeInTabFunction::ExecuteCodeInTabFunction()