Remove remaining legacy SplitString calls.

tools/gn/command_refs.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 <map>
 #include <set>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/strings/string_split.h"
@@ skipping 390 matching lines @@
   setup->build_settings().set_check_for_bad_items(false);
   if (!setup->DoSetup(args[0], false) || !setup->Run())
     return 1;
 
   // The inputs are everything but the first arg (which is the build dir).
   std::vector<std::string> inputs;
   for (size_t i = 1; i < args.size(); i++) {
     if (args[i][0] == '@') {
       // The argument is as a path to a response file.
       std::string contents;
-      std::vector<std::string> lines;
       bool ret = base::ReadFileToString(UTF8ToFilePath(args[i].substr(1)),
                                         &contents);
       if (!ret) {
         Err(Location(), "Response file " + args[i].substr(1) + " not found.")
             .PrintToStdout();
         return 1;
       }
-      base::SplitString(contents, '\n', &lines);
-      for (const auto& line : lines) {
+      for (const std::string& line : base::SplitString(
+               contents, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
         if (!line.empty())
           inputs.push_back(line);
       }
     } else {
       // The argument is a label or a path.
       inputs.push_back(args[i]);
     }
   }
 
   // Get the matches for the command-line input.
@@ skipping 50 matching lines @@
 
   // If you ask for the references of a valid target, but that target has
   // nothing referencing it, we'll get here without having printed anything.
   if (!quiet && cnt == 0)
     OutputString("Nothing references this.\n", DECORATION_YELLOW);
 
   return 0;
 }
 
 }  // namespace commands