[Extensions] Clean up unnecessary copy

chrome/browser/extensions/api/activity_log_private/activity_log_private_api.cc

 // Copyright 2013 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 "chrome/browser/extensions/api/activity_log_private/activity_log_private_api.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 191 matching lines @@
   return RespondNow(NoArguments());
 }
 
 ExtensionFunction::ResponseAction ActivityLogPrivateDeleteUrlsFunction::Run() {
   std::unique_ptr<activity_log_private::DeleteUrls::Params> params(
       activity_log_private::DeleteUrls::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   // Put the arguments in the right format.
   std::vector<GURL> gurls;
-  std::vector<std::string> urls = *params->urls.get();
-  for (std::vector<std::string>::iterator it = urls.begin();
-       it != urls.end();
-       ++it) {
-    gurls.push_back(GURL(*it));
-  }
+  const std::vector<std::string>& urls = *params->urls;
+  for (const std::string& url : urls)
+    gurls.push_back(GURL(url));
 
   ActivityLog* activity_log = ActivityLog::GetInstance(browser_context());
   DCHECK(activity_log);
   activity_log->RemoveURLs(gurls);
   return RespondNow(NoArguments());
 }
 
 }  // namespace extensions