Disable AutofillControllerTest::KeyValueFocusChange on device iOS10.

Test hangs on this iOS device running iOS 10.
Disable until we find the root cause.

Bug: 836808
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ic2dde07f54e0af49d2bc5a5584138cd631e53248
Reviewed-on: https://chromium-review.googlesource.com/1028270Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553555}

ios/chrome/browser/autofill/autofill_controller_unittest.mm

@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "base/guid.h"
+#include "base/ios/ios_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_scheduler/task_scheduler.h"
@@ -510,6 +511,13 @@ TEST_F(AutofillControllerTest, KeyValueTypedSuggestions) {
 // Checks that focusing on and typing on one field, then changing focus before
 // typing again, result in suggestions.
 TEST_F(AutofillControllerTest, KeyValueFocusChange) {
+#if !TARGET_IPHONE_SIMULATOR
+  if (!base::ios::IsRunningOnIOS11OrLater()) {
+    // TODO(crbug.com/836808): This test hangs on iOS10 devices when there are
+    // no breakpoint.
+    return;
+  }
+#endif
   SetUpKeyValueData();
 
   // Focus the dummy field and confirm no suggestions are presented.