Disable ExtensionApiTest.Messaging for OS_WIN as it is timeout/flaky.

chrome/browser/extensions/extension_messages_apitest.cc

Index: chrome/browser/extensions/extension_messages_apitest.cc
diff --git a/chrome/browser/extensions/extension_messages_apitest.cc b/chrome/browser/extensions/extension_messages_apitest.cc
index 0978509e2afa53d997ae0abe6ee0f2f85e4a612b..dd779998550ed56b4e08fcf3c8e5a58cc113f66a 100644
--- a/chrome/browser/extensions/extension_messages_apitest.cc
+++ b/chrome/browser/extensions/extension_messages_apitest.cc
@@ -134,9 +134,10 @@ class MessagingApiTest : public ExtensionApiTest {
 };
 
 // Tests that message passing between extensions and content scripts works.
-#if defined(MEMORY_SANITIZER) || defined(OS_MACOSX)
+#if defined(MEMORY_SANITIZER) || defined(OS_MACOSX) || defined(OS_WIN)
 // https://crbug.com/582185 - flakily times out on Linux/CrOS MSAN
 // https://crbug.com/681705 - flakily times out on mac_chromium_rel_ng
+// https://crbug.com/681705 - flakily times out on win_chromium_rel_ng
 #define MAYBE_Messaging DISABLED_Messaging
 #else
 #define MAYBE_Messaging Messaging