Disable flaky WebNavigationApiTest.Failures on Windows.

chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc

Index: chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
diff --git a/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc b/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
index 501248d1231533f2351788e9a139763105fb5e3b..72dd04bf3acb05840879c77a3920db60caf5c69f 100644
--- a/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
+++ b/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
@@ -463,7 +463,12 @@ IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, SimpleLoad) {
   ASSERT_TRUE(RunExtensionTest("webnavigation/simpleLoad")) << message_;
 }
 
-IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, Failures) {
+#if defined(OS_WIN)  // http://crbug.com/477840
+#define MAYBE_Failures DISABLED_Failures
+#else
+#define MAYBE_Failures Failures
+#endif
+IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, MAYBE_Failures) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("webnavigation/failures")) << message_;
 }