Enable IsolatedAppTest.CookieIsolation on windows.

chrome/browser/extensions/isolated_app_browsertest.cc

Index: chrome/browser/extensions/isolated_app_browsertest.cc
diff --git a/chrome/browser/extensions/isolated_app_browsertest.cc b/chrome/browser/extensions/isolated_app_browsertest.cc
index e387ecf7d6b57ab04620a7985793eed22a7752f9..64fb2d926025982ae67e12a8815a51eb6a70a76b 100644
--- a/chrome/browser/extensions/isolated_app_browsertest.cc
+++ b/chrome/browser/extensions/isolated_app_browsertest.cc
@@ -199,14 +199,7 @@ IN_PROC_BROWSER_TEST_F(IsolatedAppTest, CrossProcessClientRedirect) {
 // TODO(ajwong): Also test what happens if an app spans multiple sites in its
 // extent.  These origins should also be isolated, but still have origin-based
 // separation as you would expect.
-//
-// This test is disabled due to being flaky. http://crbug.com/86562
-#if defined(OS_WIN)
-#define MAYBE_CookieIsolation DISABLED_CookieIsolation
-#else
-#define MAYBE_CookieIsolation CookieIsolation
-#endif
-IN_PROC_BROWSER_TEST_F(IsolatedAppTest, MAYBE_CookieIsolation) {
+IN_PROC_BROWSER_TEST_F(IsolatedAppTest, CookieIsolation) {
   host_resolver()->AddRule("*", "127.0.0.1");
   ASSERT_TRUE(embedded_test_server()->Start());