[ios] Disable failing FullScreenTestcase test

TBR=kkhorimoto@chromium.org

Bug: 1036221
Change-Id: I92bacf040010d760ccd64df2a851770ffc5750a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978080Reviewed-by: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726729}

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

@@ -120,6 +120,11 @@ void AssertURLIs(const GURL& expectedURL) {
 // TODO(crbug.com/1022029): Enable this test.
 #if defined(CHROME_EARL_GREY_2)
   EARL_GREY_TEST_DISABLED(@"Fails with EG2");
+#elif defined(CHROME_EARL_GREY_1)
+  // TODO(crbug.com/1036221): EG1 Test fails on iOS 12.
+  if (!base::ios::IsRunningOnIOS13OrLater()) {
+    EARL_GREY_TEST_DISABLED(@"EG1 Fails on iOS 12.");
+  }
 #endif
 
   web::test::SetUpFileBasedHttpServer();