fix a problem that android cannot download files with basic authentication

net/http/http_cache_transaction.cc

Index: net/http/http_cache_transaction.cc
diff --git a/net/http/http_cache_transaction.cc b/net/http/http_cache_transaction.cc
index fce6bac43ce0d3389fc8ad0fa70ff05e9573edbe..46a1ab7876edf7e3115b24c63044ae27c9d35f1f 100644
--- a/net/http/http_cache_transaction.cc
+++ b/net/http/http_cache_transaction.cc
@@ -348,6 +348,10 @@ bool HttpCache::Transaction::IsReadyToRestartForAuth() {
   return network_trans_->IsReadyToRestartForAuth();
 }
 
+bool HttpCache::Transaction::HasAuth() const {
+  return network_trans_.get() ? network_trans_->HasAuth() : false;
+}
+
 int HttpCache::Transaction::Read(IOBuffer* buf, int buf_len,
                                  const CompletionCallback& callback) {
   DCHECK(buf);