Disable HandsOffNetworkScreenTest.RequiresNoInput on Chrome OS.

The test flakes on that platform.

BUG=674782
TBR=xiyuan@chromium.org

Review-Url: https://codereview.chromium.org/2577123005
Cr-Commit-Position: refs/heads/master@{#439118}

chrome/browser/chromeos/login/screens/network_screen_browsertest.cc

@@ -180,7 +180,13 @@ class HandsOffNetworkScreenTest : public NetworkScreenTest {
   DISALLOW_COPY_AND_ASSIGN(HandsOffNetworkScreenTest);
 };
 
-IN_PROC_BROWSER_TEST_F(HandsOffNetworkScreenTest, RequiresNoInput) {
+#if defined(OS_CHROMEOS)
+// Flaky on ChromeOS. See https://crbug.com/674782.
+#define MAYBE_RequiresNoInput DISABLED_RequiresNoInput
+#else
+#define MAYBE_RequiresNoInput RequiresNoInput
+#endif
+IN_PROC_BROWSER_TEST_F(HandsOffNetworkScreenTest, MAYBE_RequiresNoInput) {
   WizardController* wizard_controller = WizardController::default_controller();
 
   // Allow the WizardController to advance throught the enrollment flow.