[WebSocket] Send a close frame when the renderer process is gone.

content/browser/renderer_host/websocket_host.cc

Index: content/browser/renderer_host/websocket_host.cc
diff --git a/content/browser/renderer_host/websocket_host.cc b/content/browser/renderer_host/websocket_host.cc
index 7f6391803724443ca9814127df14f59ba346edcf..f778f06f0146b58d62e44fef5ce022dab6e0c189 100644
--- a/content/browser/renderer_host/websocket_host.cc
+++ b/content/browser/renderer_host/websocket_host.cc
@@ -17,6 +17,7 @@
 #include "net/http/http_util.h"
 #include "net/ssl/ssl_info.h"
 #include "net/websockets/websocket_channel.h"
+#include "net/websockets/websocket_errors.h"
 #include "net/websockets/websocket_event_interface.h"
 #include "net/websockets/websocket_frame.h"  // for WebSocketFrameHeader::OpCode
 #include "net/websockets/websocket_handshake_request_info.h"
@@ -330,6 +331,10 @@ WebSocketHost::WebSocketHost(int routing_id,
 
 WebSocketHost::~WebSocketHost() {}
 
+void WebSocketHost::GoAway() {
+  OnDropChannel(false, static_cast<uint16>(net::kWebSocketErrorGoingAway), "");
+}
+
 bool WebSocketHost::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(WebSocketHost, message)