Use v8::MicrotasksScope internally in V8RecursionScope.

content/renderer/pepper/v8_var_converter_unittest.cc

Index: content/renderer/pepper/v8_var_converter_unittest.cc
diff --git a/content/renderer/pepper/v8_var_converter_unittest.cc b/content/renderer/pepper/v8_var_converter_unittest.cc
index cd07abb4c3fc7413570a88b883b7d60e5cbb0e18..e030ffdbd72454da01c46cdaacc8da866e3be030 100644
--- a/content/renderer/pepper/v8_var_converter_unittest.cc
+++ b/content/renderer/pepper/v8_var_converter_unittest.cc
@@ -29,6 +29,7 @@
 #include "ppapi/shared_impl/var.h"
 #include "ppapi/shared_impl/var_tracker.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
 #include "v8/include/v8.h"
 
 using ppapi::ArrayBufferVar;
@@ -403,6 +404,7 @@ TEST_F(V8VarConverterTest, StrangeDictionaryKeyTest) {
     v8::Local<v8::Context> context =
         v8::Local<v8::Context>::New(isolate_, context_);
     v8::Context::Scope context_scope(context);
+    blink::WebScopedMicrotaskSuppression microtasks_scope;
 
     const char* source =
         "(function() {"