Properly handle spdy3 responses.

net/socket/stream_socket.h

Index: net/socket/stream_socket.h
diff --git a/net/socket/stream_socket.h b/net/socket/stream_socket.h
index e7ea2bee56911104852162c9a83dc846327a0759..9efbcfd022ca04ea0ab61e72e978eb338dad513f 100644
--- a/net/socket/stream_socket.h
+++ b/net/socket/stream_socket.h
@@ -20,6 +20,19 @@ class NET_EXPORT_PRIVATE StreamSocket : public Socket {
  public:
   virtual ~StreamSocket() {}
 
+  // Next Protocol Negotiation (NPN), if successful, results in agreement on an
+  // application-level string that specifies the application level protocol to
+  // use over the TLS connection. NextProto enumerates the application level
+  // protocols that we recognise.
+  enum NextProto {
+    kProtoUnknown = 0,
+    kProtoHTTP11 = 1,
+    kProtoSPDY1 = 2,
+    kProtoSPDY2 = 3,
+    kProtoSPDY21 = 4,
+    kProtoSPDY3 = 5,
+  };
+
   // Called to establish a connection.  Returns OK if the connection could be
   // established synchronously.  Otherwise, ERR_IO_PENDING is returned and the
   // given callback will run asynchronously when the connection is established