[Extensions] Clean up unnecessary copy

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

Index: chrome/browser/extensions/api/activity_log_private/activity_log_private_api.cc
diff --git a/chrome/browser/extensions/api/activity_log_private/activity_log_private_api.cc b/chrome/browser/extensions/api/activity_log_private/activity_log_private_api.cc
index ed8cd7b117c19926c7061a9a5e69c719612a48a7..e5a6ffa422730ad74159d56ead087e14138ffa67 100644
--- a/chrome/browser/extensions/api/activity_log_private/activity_log_private_api.cc
+++ b/chrome/browser/extensions/api/activity_log_private/activity_log_private_api.cc
@@ -209,12 +209,9 @@ ExtensionFunction::ResponseAction ActivityLogPrivateDeleteUrlsFunction::Run() {
 
   // 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);