Fix one more size_t/uint32 casting issue for the mac.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/269040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@28637 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/net/flip/flip_session.h b/net/flip/flip_session.h
index 6d92c11..c8e3f1e 100644
--- a/net/flip/flip_session.h
+++ b/net/flip/flip_session.h
@@ -130,7 +130,7 @@
   virtual void OnError(flip::FlipFramer*);
   virtual void OnStreamFrameData(flip::FlipStreamId stream_id,
                                  const char* data,
-                                 uint32 len);
+                                 size_t len);
   virtual void OnControl(const flip::FlipControlFrame* frame);
   virtual void OnLameDuck();