Send socket read error in GOAWAY.

net/spdy/spdy_session.cc

Index: net/spdy/spdy_session.cc
diff --git a/net/spdy/spdy_session.cc b/net/spdy/spdy_session.cc
index 97b5837cde2b012c94e4286122e727c71ed3ae78..5d3516399e2c4e114f51fd5f05d9dfe25f0c9452 100644
--- a/net/spdy/spdy_session.cc
+++ b/net/spdy/spdy_session.cc
@@ -1491,7 +1491,9 @@ int SpdySession::DoReadComplete(int result) {
   }
 
   if (result < 0) {
-    DoDrainSession(static_cast<Error>(result), "result is < 0.");
+    DoDrainSession(
+        static_cast<Error>(result),
+        base::StringPrintf("Error %d reading from socket.", -result));
     return result;
   }
   CHECK_LE(result, kReadBufferSize);