[Extensions] Convert some callers of ScriptContext::CallFunction

extensions/renderer/guest_view/guest_view_internal_custom_bindings.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/guest_view/guest_view_internal_custom_bindings.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 409 matching lines @@
 
   // Let the GuestViewManager know that a GuestView has been created.
   const std::string& view_type = *v8::String::Utf8Value(args[2]);
   content::RenderThread::Get()->Send(
       new GuestViewHostMsg_ViewCreated(view_instance_id, view_type));
 }
 
 void GuestViewInternalCustomBindings::RunWithGesture(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   // Gesture is required to request fullscreen.
+  // TODO(devlin): All this needs to do is enter fullscreen. We should make this
+  // EnterFullscreen() and do it directly rather than having a generic "run with
+  // user gesture" function.
   blink::WebScopedUserGesture user_gesture(context()->web_frame());
   CHECK_EQ(args.Length(), 1);
   CHECK(args[0]->IsFunction());
-  v8::Local<v8::Value> no_args;
-  context()->CallFunction(v8::Local<v8::Function>::Cast(args[0]), 0, &no_args);
+  context()->SafeCallFunction(
+      v8::Local<v8::Function>::Cast(args[0]), 0, nullptr);
 }
 
 }  // namespace extensions