Fix calculation of length in websocket.cc.

net/websockets/websocket.cc

Index: net/websockets/websocket.cc
diff --git a/net/websockets/websocket.cc b/net/websockets/websocket.cc
index 4fa0bfdee64f754ff90f42d8a9745d917c30cc0f..9b2b142886ba4ac6d2fd2377fca292858a5370da 100644
--- a/net/websockets/websocket.cc
+++ b/net/websockets/websocket.cc
@@ -380,7 +380,7 @@ void WebSocket::ProcessFrameData() {
           socket_stream_->Close();
           return;
         }
-        length = length * 128 + *p & 0x7f;
+        length = length * 128 + (*p & 0x7f);
         ++p;
       }
       // Checks if the frame body hasn't been completely received yet.