Remove legacy StartsWithASCII function.

content/browser/fileapi/fileapi_message_filter.cc

Index: content/browser/fileapi/fileapi_message_filter.cc
diff --git a/content/browser/fileapi/fileapi_message_filter.cc b/content/browser/fileapi/fileapi_message_filter.cc
index 0541c3a9d7c07db8914dc7c8cf257bd572cff014..1babfd5454669950913d90559b765cd992354bc2 100644
--- a/content/browser/fileapi/fileapi_message_filter.cc
+++ b/content/browser/fileapi/fileapi_message_filter.cc
@@ -597,8 +597,8 @@ void FileAPIMessageFilter::OnStartBuildingStream(
     const GURL& url, const std::string& content_type) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   // Only an internal Blob URL is expected here. See the BlobURL of the Blink.
-  if (!base::StartsWithASCII(url.path(), "blobinternal%3A///",
-                             true /* case_sensitive */)) {
+  if (!base::StartsWith(url.path(), "blobinternal%3A///",
+                        base::CompareCase::SENSITIVE)) {
     NOTREACHED() << "Malformed Stream URL: " << url.spec();
     bad_message::ReceivedBadMessage(this,
                                     bad_message::FAMF_MALFORMED_STREAM_URL);