Replace ToLower calls to the new format

components/plugins/renderer/mobile_youtube_plugin.cc

 // Copyright 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 "components/plugins/renderer/mobile_youtube_plugin.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
@@ skipping 31 matching lines @@
   return webui::GetI18nTemplateHtml(template_html, &values);
 }
 
 bool IsValidYouTubeVideo(const std::string& path) {
   unsigned len = strlen(kSlashVSlash);
 
   // check for more than just /v/ or /e/.
   if (path.length() <= len)
     return false;
 
-  std::string str = base::StringToLowerASCII(path);
   // Youtube flash url can start with /v/ or /e/.
-  if (strncmp(str.data(), kSlashVSlash, len) != 0 &&
-      strncmp(str.data(), kSlashESlash, len) != 0)
+  if (!base::StartsWith(path, kSlashVSlash,
+                        base::CompareCase::INSENSITIVE_ASCII) ||
+      !base::StartsWith(path, kSlashESlash,
+                        base::CompareCase::INSENSITIVE_ASCII))
     return false;
 
   // Start after /v/
   for (unsigned i = len; i < path.length(); i++) {
-    char c = str[i];
+    char c = path[i];
     if (isalpha(c) || isdigit(c) || c == '_' || c == '-')
       continue;
     // The url can have more parameters such as &hl=en after the video id.
     // Once we start seeing extra parameters we can return true.
     return c == '&' && i > len;
   }
   return true;
 }
 
 }  // namespace
@@ skipping 43 matching lines @@
 }
 
 gin::ObjectTemplateBuilder MobileYouTubePlugin::GetObjectTemplateBuilder(
     v8::Isolate* isolate) {
   return gin::Wrappable<MobileYouTubePlugin>::GetObjectTemplateBuilder(isolate)
       .SetMethod("openYoutubeURL",
                  &MobileYouTubePlugin::OpenYoutubeUrlCallback);
 }
 
 }  // namespace plugins