Update base::StartsWith calls to new form

chrome/browser/media/router/media_source_helper.cc

 // Copyright 2015 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 "chrome/browser/media/router/media_source_helper.h"
 
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/media/router/media_source.h"
 #include "url/gurl.h"
@@ skipping 16 matching lines @@
 
 MediaSource MediaSourceForCastApp(const std::string& app_id) {
   return MediaSource(kCastUrnPrefix + app_id);
 }
 
 MediaSource MediaSourceForPresentationUrl(const std::string& presentation_url) {
   return MediaSource(presentation_url);
 }
 
 bool IsMirroringMediaSource(const MediaSource& source) {
-  return base::StartsWithASCII(source.id(), kDesktopMediaUrn, true) ||
-         base::StartsWithASCII(source.id(), kTabMediaUrnPrefix, true);
+  return base::StartsWith(source.id(), kDesktopMediaUrn,
+                          base::CompareCase::SENSITIVE) ||
+         base::StartsWith(source.id(), kTabMediaUrnPrefix,
+                          base::CompareCase::SENSITIVE);
 }
 
 bool IsValidMediaSource(const MediaSource& source) {
   if (IsMirroringMediaSource(source) ||
-      base::StartsWithASCII(source.id(), kCastUrnPrefix, true)) {
+      base::StartsWith(source.id(), kCastUrnPrefix,
+                       base::CompareCase::SENSITIVE)) {
     return true;
   }
   GURL url(source.id());
   return url.is_valid() && url.SchemeIsHTTPOrHTTPS();
 }
 
 std::string PresentationUrlFromMediaSource(const MediaSource& source) {
   return IsValidPresentationUrl(source.id()) ? source.id() : "";
 }
 
 bool IsValidPresentationUrl(const std::string& url) {
   GURL gurl(url);
   return gurl.is_valid() && gurl.SchemeIsHTTPOrHTTPS();
 }
 
 }  // namespace media_router