Set flaky browser test incognito reconnect session to MANUAL

TBR=mfoltz@chromium.org

Bug: 822300
Change-Id: Ie6f6ab2d24a28c7fab95764185f6e548aae23cd2
Reviewed-on: https://chromium-review.googlesource.com/964543Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543404}

chrome/test/media_router/media_router_integration_browsertest.cc

@@ -887,8 +887,9 @@ IN_PROC_BROWSER_TEST_F(MediaRouterIntegrationIncognitoBrowserTest, Basic) {
   RunBasicTest();
 }
 
+// TODO(crbug.com/822300): Flaky test.
 IN_PROC_BROWSER_TEST_F(MediaRouterIntegrationIncognitoBrowserTest,
-                       ReconnectSession) {
+                       MANUAL_ReconnectSession) {
   RunReconnectSessionTest();
 }