Add more string_util functions to base namespace.

tools/gn/command_args.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 <stdio.h>
 #include <stdlib.h>
 
 #include <map>
 
 #include "base/command_line.h"
@@ skipping 193 matching lines @@
   if (!editor_ptr)
     editor_ptr = "vi";
 
   std::string cmd(editor_ptr);
   cmd.append(" \"");
 
   // Its impossible to do this properly since we don't know the user's shell,
   // but quoting and escaping internal quotes should handle 99.999% of all
   // cases.
   std::string escaped_name = file_to_edit.value();
-  ReplaceSubstringsAfterOffset(&escaped_name, 0, "\"", "\\\"");
+  base::ReplaceSubstringsAfterOffset(&escaped_name, 0, "\"", "\\\"");
   cmd.append(escaped_name);
   cmd.push_back('"');
 
   OutputString("Waiting for editor on \"" + file_to_edit.value() +
                "\"...\n");
   return system(cmd.c_str()) == 0;
 }
 
 #endif
 
@@ skipping 18 matching lines @@
     if (!base::PathExists(arg_file)) {
       std::string argfile_default_contents =
           "# Build arguments go here. Examples:\n"
           "#   is_component_build = true\n"
           "#   is_debug = false\n"
           "# See \"gn args <out_dir> --list\" for available build "
           "arguments.\n";
 #if defined(OS_WIN)
       // Use Windows lineendings for this file since it will often open in
       // Notepad which can't handle Unix ones.
-      ReplaceSubstringsAfterOffset(&argfile_default_contents, 0, "\n", "\r\n");
+      base::ReplaceSubstringsAfterOffset(
+          &argfile_default_contents, 0, "\n", "\r\n");
 #endif
       base::CreateDirectory(arg_file.DirName());
       base::WriteFile(arg_file, argfile_default_contents.c_str(),
                       static_cast<int>(argfile_default_contents.size()));
     }
 
     ScopedTrace editor_trace(TraceItem::TRACE_SETUP, "Waiting for editor");
     if (!RunEditor(arg_file))
       return 1;
   }
@@ skipping 75 matching lines @@
         "Or see \"gn help args\" for more variants.").PrintToStdout();
     return 1;
   }
 
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(kSwitchList))
     return ListArgs(args[0]);
   return EditArgsFile(args[0]);
 }
 
 }  // namespace commands