[net/http auth] Use strings to identify authentication schemes.

content/browser/media/android/media_resource_getter_impl.cc

Index: content/browser/media/android/media_resource_getter_impl.cc
diff --git a/content/browser/media/android/media_resource_getter_impl.cc b/content/browser/media/android/media_resource_getter_impl.cc
index 3afe5688d48d6f10fc3f75e240237e9965520860..566aa0fc9b98908f91929349bfd665550d6aa20e 100644
--- a/content/browser/media/android/media_resource_getter_impl.cc
+++ b/content/browser/media/android/media_resource_getter_impl.cc
@@ -215,7 +215,7 @@ net::AuthCredentials MediaResourceGetterTask::RequestAuthCredentials(
       auth_cache->LookupByPath(url.GetOrigin(), url.path());
 
   // TODO(qinmin): handle other auth schemes. See http://crbug.com/395219.
-  if (entry && entry->scheme() == net::HttpAuth::AUTH_SCHEME_BASIC)
+  if (entry && entry->scheme() == "basic")
     return entry->credentials();
   else
     return net::AuthCredentials();