Replace more for loops in GN

tools/gn/commands.cc

 // Copyright (c) 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 "tools/gn/commands.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/item.h"
 #include "tools/gn/label.h"
 #include "tools/gn/label_pattern.h"
 #include "tools/gn/setup.h"
@@ skipping 95 matching lines @@
     // explicitly.
     if (pattern.toolchain().is_null()) {
       // No explicit toolchain set.
       pattern.set_toolchain(setup->loader()->default_toolchain_label());
     }
   }
 
   std::vector<const Target*> all_targets =
       setup->builder()->GetAllResolvedTargets();
 
-  for (size_t i = 0; i < all_targets.size(); i++) {
-    if (pattern.Matches(all_targets[i]->label()))
-      matches->push_back(all_targets[i]);
+  for (const auto& target : all_targets) {
+    if (pattern.Matches(target->label()))
+      matches->push_back(target);
   }
   return true;
 }
 
 }  // namespace commands