Use v8::MicrotasksScope internally in V8RecursionScope.

extensions/renderer/safe_builtins.cc

Index: extensions/renderer/safe_builtins.cc
diff --git a/extensions/renderer/safe_builtins.cc b/extensions/renderer/safe_builtins.cc
index 3bfa01aaa5fbc04a49d7846a599bdb73d7e731c2..3a66eaf12643d09d7c7660f9da390bab7df70975 100644
--- a/extensions/renderer/safe_builtins.cc
+++ b/extensions/renderer/safe_builtins.cc
@@ -9,6 +9,7 @@
 #include "base/strings/stringprintf.h"
 #include "extensions/renderer/script_context.h"
 #include "extensions/renderer/v8_helpers.h"
+#include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
 
 namespace extensions {
 
@@ -200,6 +201,7 @@ class ExtensionImpl : public v8::Extension {
         return;
     }
 
+    blink::WebScopedMicrotaskSuppression microtasks_scope;
     v8::Local<v8::Value> return_value;
     if (function->Call(context, recv, argc, argv.get()).ToLocal(&return_value))
       info.GetReturnValue().Set(return_value);