Convert remaining StringToLowerASCII to ToLowerASCII

content/common/plugin_list.cc

Index: content/common/plugin_list.cc
diff --git a/content/common/plugin_list.cc b/content/common/plugin_list.cc
index 1cc8fa577e59003d9888b5c4d8bf09c9eb2d46f2..c162727b01588f44b19bb89b6a7364f62563af44 100644
--- a/content/common/plugin_list.cc
+++ b/content/common/plugin_list.cc
@@ -145,7 +145,7 @@ bool PluginList::ParseMimeTypes(
 
   for (size_t i = 0; i < mime_types.size(); ++i) {
     WebPluginMimeType mime_type;
-    mime_type.mime_type = base::StringToLowerASCII(mime_types[i]);
+    mime_type.mime_type = base::ToLowerASCII(mime_types[i]);
     if (file_extensions.size() > i) {
       mime_type.file_extensions = base::SplitString(
           file_extensions[i], ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
@@ -317,7 +317,7 @@ void PluginList::GetPluginInfoArray(
     bool include_npapi,
     std::vector<WebPluginInfo>* info,
     std::vector<std::string>* actual_mime_types) {
-  DCHECK(mime_type == base::StringToLowerASCII(mime_type));
+  DCHECK(mime_type == base::ToLowerASCII(mime_type));
   DCHECK(info);
 
   if (!use_stale)
@@ -353,7 +353,7 @@ void PluginList::GetPluginInfoArray(
   std::string::size_type last_dot = path.rfind('.');
   if (last_dot != std::string::npos && mime_type.empty()) {
     std::string extension =
-        base::StringToLowerASCII(std::string(path, last_dot+1));
+        base::ToLowerASCII(base::StringPiece(path).substr(last_dot + 1));
     std::string actual_mime_type;
     for (size_t i = 0; i < plugins_list_.size(); ++i) {
       if (SupportsExtension(plugins_list_[i], extension, &actual_mime_type)) {