Fix net_unittests build errors when enable_bidirectional_stream is set.

net/spdy/bidirectional_stream_spdy_job.cc

Index: net/spdy/bidirectional_stream_spdy_job.cc
diff --git a/net/spdy/bidirectional_stream_spdy_job.cc b/net/spdy/bidirectional_stream_spdy_job.cc
index 086d1b20832ddab7354d2b66017deb57c72b7e7f..553d191c63d10e4b97fef4d6bb9857dab2da204f 100644
--- a/net/spdy/bidirectional_stream_spdy_job.cc
+++ b/net/spdy/bidirectional_stream_spdy_job.cc
@@ -22,7 +22,7 @@ namespace {
 // Time to wait in millisecond to notify |delegate_| of data received.
 // Handing small chunks of data to the caller creates measurable overhead.
 // So buffer data in short time-spans and send a single read notification.
-const int64 kBufferTimeMs = 1;
+const int kBufferTimeMs = 1;
 
 }  // namespace