Update base::StartsWith calls to new form

chrome/renderer/extensions/extension_localization_peer.cc

Index: chrome/renderer/extensions/extension_localization_peer.cc
diff --git a/chrome/renderer/extensions/extension_localization_peer.cc b/chrome/renderer/extensions/extension_localization_peer.cc
index 17b9756a51df215fafec51072bd8788e3d6c37d5..bb0adb7faba830b84b35edf70c848fce7a423f80 100644
--- a/chrome/renderer/extensions/extension_localization_peer.cc
+++ b/chrome/renderer/extensions/extension_localization_peer.cc
@@ -55,7 +55,8 @@ ExtensionLocalizationPeer::CreateExtensionLocalizationPeer(
   // Return NULL if content is not text/css or it doesn't belong to extension
   // scheme.
   return (request_url.SchemeIs(extensions::kExtensionScheme) &&
-          base::StartsWithASCII(mime_type, "text/css", false))
+          base::StartsWith(mime_type, "text/css",
+                           base::CompareCase::INSENSITIVE_ASCII))
              ? new ExtensionLocalizationPeer(peer, message_sender, request_url)
              : NULL;
 }