Convert remaining StringToLowerASCII to ToLowerASCII

ui/gl/gl_version_info.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 "ui/gl/gl_version_info.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
 
@@ skipping 49 matching lines @@
                                        unsigned* minor_version,
                                        bool* is_es,
                                        bool* is_es3) {
   // Make sure the outputs are always initialized.
   *major_version = 0;
   *minor_version = 0;
   *is_es = false;
   *is_es3 = false;
   if (!version_str)
     return;
-  std::string lstr(base::StringToLowerASCII(std::string(version_str)));
+  std::string lstr(base::ToLowerASCII(version_str));
   *is_es = (lstr.length() > 12) && (lstr.substr(0, 9) == "opengl es");
   if (*is_es)
     lstr = lstr.substr(10, 3);
   base::StringTokenizer tokenizer(lstr.begin(), lstr.end(), ".");
   unsigned major, minor;
   if (tokenizer.GetNext() &&
       base::StringToUint(tokenizer.token_piece(), &major)) {
     *major_version = major;
     if (tokenizer.GetNext() &&
         base::StringToUint(tokenizer.token_piece(), &minor)) {
       *minor_version = minor;
     }
   }
   if (*is_es && *major_version == 3)
     *is_es3 = true;
 }
 
 }  // namespace gfx