[ios] Disable AutofillMetricsTest.FrameHasNoForm on iOS 12 device

Test is consistently failing on downstream bots (iPhone and iPad device)

Bug: 1127005
TBR: kazinova@chromium.org
Change-Id: I317f1df8363dfe5139810d8082209e0e9434e57b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404404Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805870}

components/autofill/core/browser/autofill_metrics_unittest.cc

@@ -12,6 +12,7 @@
 
 #include "base/base64.h"
 #include "base/feature_list.h"
+#include "base/ios/ios_util.h"
 #include "base/macros.h"
 #include "base/metrics/metrics_hashes.h"
 #include "base/metrics/statistics_recorder.h"
@@ -10421,6 +10422,13 @@ TEST_F(AutofillMetricsTest,
 // Verify that we don't log Autofill.WebOTP.OneTimeCode.FromAutocomplete if the
 // frame has no form.
 TEST_F(AutofillMetricsTest, FrameHasNoForm) {
+#if defined(OS_IOS) && !TARGET_IPHONE_SIMULATOR
+  // TODO(crbug.com/1127005): Test is failing on iOS 12 device.
+  if (!base::ios::IsRunningOnOrLater(13, 0, 0)) {
+    return;
+  }
+#endif
+
   autofill_manager_.reset();
   EXPECT_FALSE(base::StatisticsRecorder::FindHistogram(
       "Autofill.WebOTP.OneTimeCode.FromAutocomplete"));