Disable FullscreenTestCase.testShowHeaderOnErrorPage

This CL disables the FullscreenTestCase.testShowHeaderOnErrorPage test
which is constently failing on iOS 10 devices.

Bug: 855368
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I24b5e8cadb05505974af0e38e8e850593d03e386
Reviewed-on: https://chromium-review.googlesource.com/1111712
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569618}

ios/chrome/browser/ui/fullscreen/fullscreen_egtest.mm

@@ -427,6 +427,12 @@ void AssertURLIs(const GURL& expectedURL) {
 // Tests that the header is shown when loading an error page in a native view
 // even if fullscreen was enabled previously.
 - (void)testShowHeaderOnErrorPage {
+#if TARGET_OS_SIMULATOR
+  if (!base::ios::IsRunningOnIOS11OrLater()) {
+    // TODO(crbug.com/855368): Reenable this test.
+    EARL_GREY_TEST_DISABLED(@"Test failing on iOS 10 devices");
+  }
+#endif  // TARGET_OS_SIMULATOR
   std::map<GURL, std::string> responses;
   const GURL URL = web::test::HttpServer::MakeUrl("http://origin");
   // A long page with some simple text -- a long page is necessary so that