Move more string_util functions to base namespace.

tools/gn/label_pattern.cc

 // Copyright 2014 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_pattern.h"
 
 #include "base/strings/string_util.h"
 #include "tools/gn/err.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/value.h"
@@ skipping 114 matching lines @@
   size_t offset = 0;
 #if defined(OS_WIN)
   if (IsPathAbsolute(str)) {
     if (str[0] != '/') {
       *err = Err(value, "Bad absolute path.",
                  "Absolute paths must be of the form /C:\\ but this is \"" +
                      str.as_string() + "\".");
       return LabelPattern();
     }
     if (str.size() > 3 && str[2] == ':' && IsSlash(str[3]) &&
-        IsAsciiAlpha(str[1])) {
+        base::IsAsciiAlpha(str[1])) {
       // Skip over the drive letter colon.
       offset = 3;
     }
   }
 #endif
   size_t colon = str.find(':', offset);
   if (colon == std::string::npos) {
     path = base::StringPiece(str);
   } else {
     path = str.substr(0, colon);
@@ skipping 111 matching lines @@
       break;
   }
 
   if (!toolchain_.is_null()) {
     result.push_back('(');
     result.append(toolchain_.GetUserVisibleName(false));
     result.push_back(')');
   }
   return result;
 }