Convert remaining StringToLowerASCII to ToLowerASCII

content/child/npapi/plugin_stream.cc

Index: content/child/npapi/plugin_stream.cc
diff --git a/content/child/npapi/plugin_stream.cc b/content/child/npapi/plugin_stream.cc
index 4066dcec7048e9042cecc2b40e76985d8fe7d803..282f69b1f736d73a119359a86afface7a8553c09 100644
--- a/content/child/npapi/plugin_stream.cc
+++ b/content/child/npapi/plugin_stream.cc
@@ -64,7 +64,7 @@ bool PluginStream::Open(const std::string& mime_type,
 
   bool seekable_stream = false;
   if (request_is_seekable) {
-    std::string headers_lc = base::StringToLowerASCII(headers);
+    std::string headers_lc = base::ToLowerASCII(headers);
     if (headers_lc.find("accept-ranges: bytes") != std::string::npos) {
       seekable_stream = true;
     }