Fix a bug in UserScriptLoader.

extensions/browser/user_script_loader.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/browser/user_script_loader.h"
 
 #include <set>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 429 matching lines @@
     // Pretend the extension change didn't happen.
     return;
   }
 
   // We've got scripts ready to go.
   shared_memory_.reset(shared_memory.release());
 
   // If user scripts are coming from a <webview>, will only notify the
   // RenderProcessHost of that <webview>; otherwise will notify all of the
   // RenderProcessHosts.
-  if (user_scripts && !user_scripts->empty() &&
-      (*user_scripts)[0].consumer_instance_type() ==
+  if (user_scripts_ && !user_scripts_->empty() &&
+      (*user_scripts_)[0].consumer_instance_type() ==
           UserScript::ConsumerInstanceType::WEBVIEW) {
-    DCHECK_EQ(1u, user_scripts->size());
-    int render_process_id = (*user_scripts)[0].routing_info().render_process_id;
+    DCHECK_EQ(1u, user_scripts_->size());
+    int render_process_id =
+        (*user_scripts_)[0].routing_info().render_process_id;
     content::RenderProcessHost* host =
         content::RenderProcessHost::FromID(render_process_id);
     if (host)
       SendUpdate(host, shared_memory_.get(), changed_hosts_);
   } else {
     for (content::RenderProcessHost::iterator i(
             content::RenderProcessHost::AllHostsIterator());
         !i.IsAtEnd(); i.Advance()) {
       SendUpdate(i.GetCurrentValue(), shared_memory_.get(), changed_hosts_);
     }
@@ skipping 34 matching lines @@
   for (const HostID& id : changed_hosts)
     changed_ids_set.insert(id.id());
 
   if (base::SharedMemory::IsHandleValid(handle_for_process)) {
     process->Send(new ExtensionMsg_UpdateUserScripts(
         handle_for_process, host_id().id(), changed_ids_set));
   }
 }
 
 }  // namespace extensions