[Extensions] Re-enable a Management API test on Windows.

ExtensionManagementApiTest.Uninstall was disabled for flakiness
many years ago. It is no longer flaky.

Bug: 174411
Change-Id: I5f1bc2ff2d52edaf1f347856133446600c3336e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432405Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811381}

chrome/browser/extensions/api/management/management_apitest.cc

@@ -130,14 +130,7 @@ IN_PROC_BROWSER_TEST_F(ExtensionManagementApiTest, NoPermission) {
   ASSERT_TRUE(RunExtensionSubtest("management/no_permission", "test.html"));
 }
 
-// Disabled: http://crbug.com/174411
-#if defined(OS_WIN)
-#define MAYBE_Uninstall DISABLED_Uninstall
-#else
-#define MAYBE_Uninstall Uninstall
-#endif
-
-IN_PROC_BROWSER_TEST_F(ExtensionManagementApiTest, MAYBE_Uninstall) {
+IN_PROC_BROWSER_TEST_F(ExtensionManagementApiTest, Uninstall) {
   LoadExtensions();
   // Confirmation dialog will be shown for uninstallations except for self.
   extensions::ScopedTestDialogAutoConfirm auto_confirm(