Run clang-modernize -use-nullptr over src/extensions/.

extensions/renderer/guest_view/guest_view_container.cc

Index: extensions/renderer/guest_view/guest_view_container.cc
diff --git a/extensions/renderer/guest_view/guest_view_container.cc b/extensions/renderer/guest_view/guest_view_container.cc
index 8ef8054ae714ce18059109e5f2029960d9d28113..22548bc5bafc39ac6e28e9d7e5689caa8e73cd63 100644
--- a/extensions/renderer/guest_view/guest_view_container.cc
+++ b/extensions/renderer/guest_view/guest_view_container.cc
@@ -23,9 +23,8 @@ static base::LazyInstance<GuestViewContainerMap> g_guest_view_container_map =
 
 namespace extensions {
 
-GuestViewContainer::GuestViewContainer(
-    content::RenderFrame* render_frame,
-    const std::string& mime_type)
+GuestViewContainer::GuestViewContainer(content::RenderFrame* render_frame,
+                                       const std::string& mime_type)
     : content::BrowserPluginDelegate(render_frame, mime_type),
       content::RenderFrameObserver(render_frame),
       mime_type_(mime_type),
@@ -33,7 +32,7 @@ GuestViewContainer::GuestViewContainer(
       render_view_routing_id_(render_frame->GetRenderView()->GetRoutingID()),
       attached_(false),
       attach_pending_(false),
-      isolate_(NULL) {
+      isolate_(nullptr) {
 }
 
 GuestViewContainer::~GuestViewContainer() {
@@ -49,7 +48,7 @@ GuestViewContainer* GuestViewContainer::FromID(int render_view_routing_id,
       g_guest_view_container_map.Pointer();
   GuestViewContainerMap::iterator it = guest_view_containers->find(
       GuestViewID(render_view_routing_id, element_instance_id));
-  return it == guest_view_containers->end() ? NULL : it->second;
+  return it == guest_view_containers->end() ? nullptr : it->second;
 }