Disable Flaky WebNavigationApiTest.UserAction 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 04907864bdec0dd5a2a2052740c888ce6c1e20a2..21ef77adb77938961146f320d056f6cd628b1c97 100644
--- a/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
+++ b/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
@@ -509,7 +509,13 @@ IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, FilteredTest) {
   ASSERT_TRUE(RunExtensionTest("webnavigation/filtered")) << message_;
 }
 
-IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, UserAction) {
+// Flaky on Windows. See http://crbug.com/662160.
+#if defined(OS_WIN)
+#define MAYBE_UserAction DISABLED_UserAction
+#else
+#define MAYBE_UserAction UserAction
+#endif
+IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, MAYBE_UserAction) {
   content::IsolateAllSitesForTesting(base::CommandLine::ForCurrentProcess());
   ASSERT_TRUE(StartEmbeddedTestServer());