Let --js-flags work when Harmony is enabled in about:flags

content/renderer/render_process_impl.cc

Index: content/renderer/render_process_impl.cc
diff --git a/content/renderer/render_process_impl.cc b/content/renderer/render_process_impl.cc
index 421e60bcf9661736327ea97127ed5d8dbd4a1c6b..545d02705ffec8318c3d0ac5059997b6aa7c81f4 100644
--- a/content/renderer/render_process_impl.cc
+++ b/content/renderer/render_process_impl.cc
@@ -56,6 +56,11 @@ RenderProcessImpl::RenderProcessImpl()
     v8::V8::SetFlagsFromString(flags.c_str(), static_cast<int>(flags.size()));
   }
 
+  if (command_line.HasSwitch(switches::kJavaScriptHarmony)) {
+    std::string flags("--harmony");
+    v8::V8::SetFlagsFromString(flags.c_str(), static_cast<int>(flags.size()));
+  }
+
   // Turn on cross-site document blocking for renderer processes.
   SiteIsolationPolicy::SetPolicyEnabled(
       GetContentClient()->renderer()->ShouldEnableSiteIsolationPolicy());