[Sheriff] Disable flaky test ExtensionWebRequestApiTest.WebSocketRequest

Bug: 1121727
Change-Id: Ieb912ce68333686afb25a6a38b75628a807e94fb
NoTry: True
Tbr: karandeepb@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376446Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801517}

chrome/browser/extensions/api/web_request/web_request_apitest.cc

@@ -1476,7 +1476,8 @@ IN_PROC_BROWSER_TEST_F(ExtensionWebRequestApiTest,
 
 // Test that the webRequest events are dispatched for the WebSocket handshake
 // requests.
-IN_PROC_BROWSER_TEST_F(ExtensionWebRequestApiTest, WebSocketRequest) {
+// TODO(crbug.com/1121727): Test is flaky on multiple platforms.
+IN_PROC_BROWSER_TEST_F(ExtensionWebRequestApiTest, DISABLED_WebSocketRequest) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(StartWebSocketServer(net::GetWebSocketTestDataDirectory()));
   ASSERT_TRUE(RunExtensionSubtest("webrequest", "test_websocket.html"))