Move more string_util functions to base namespace.

tools/gn/label.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/label.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "tools/gn/err.h"
 #include "tools/gn/filesystem_utils.h"
@@ skipping 87 matching lines @@
   size_t offset = 0;
 #if defined(OS_WIN)
   if (IsPathAbsolute(input)) {
     if (input[0] != '/') {
       *err = Err(original_value, "Bad absolute path.",
                  "Absolute paths must be of the form /C:\\ but this is \"" +
                      input.as_string() + "\".");
       return false;
     }
     if (input.size() > 3 && input[2] == ':' && IsSlash(input[3]) &&
-        IsAsciiAlpha(input[1])) {
+        base::IsAsciiAlpha(input[1])) {
       // Skip over the drive letter colon.
       offset = 3;
     }
   }
 #endif
   size_t path_separator = input.find_first_of(":(", offset);
   base::StringPiece location_piece;
   base::StringPiece name_piece;
   base::StringPiece toolchain_piece;
   if (path_separator == std::string::npos) {
@@ skipping 151 matching lines @@
   }
   return ret;
 }
 
 std::string Label::GetUserVisibleName(const Label& default_toolchain) const {
   bool include_toolchain =
       default_toolchain.dir() != toolchain_dir_ ||
       default_toolchain.name() != toolchain_name_;
   return GetUserVisibleName(include_toolchain);
 }