Use std::tie() for operator< in extensions/

extensions/browser/process_map.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 "extensions/browser/process_map.h"
 
+#include <tuple>
+
 #include "content/public/browser/child_process_security_policy.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/process_map_factory.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/features/feature.h"
 
 namespace extensions {
 
 // Item
 struct ProcessMap::Item {
@@ skipping 12 matching lines @@
        int site_instance_id)
       : extension_id(extension_id),
         process_id(process_id),
         site_instance_id(site_instance_id) {
   }
 
   ~Item() {
   }
 
   bool operator<(const ProcessMap::Item& other) const {
-    if (extension_id < other.extension_id)
-      return true;
-
-    if (extension_id == other.extension_id &&
-        process_id < other.process_id) {
-      return true;
-    }
-
-    if (extension_id == other.extension_id &&
-        process_id == other.process_id &&
-        site_instance_id < other.site_instance_id) {
-      return true;
-    }
-
-    return false;
+    return std::tie(extension_id, process_id, site_instance_id) <
+           std::tie(other.extension_id, other.process_id,
+                    other.site_instance_id);
   }
 
   std::string extension_id;
   int process_id;
   int site_instance_id;
 };
 
 
 // ProcessMap
 ProcessMap::ProcessMap() {
@@ skipping 83 matching lines @@
 
   if (extension->is_hosted_app() &&
       extension->location() != Manifest::COMPONENT) {
     return Feature::BLESSED_WEB_PAGE_CONTEXT;
   }
 
   return Feature::BLESSED_EXTENSION_CONTEXT;
 }
 
 }  // namespace extensions