VR: Disable autofill suggestion in VR

This CL builds on comments from:
  https://chromium-review.googlesource.com/c/chromium/src/+/934621

Bug: 808456
Change-Id: I02cbee03f1b7f4214b43fe655453b8057a680cdb
Reviewed-on: https://chromium-review.googlesource.com/940461Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Commit-Queue: Yash Malik <ymalik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539934}

components/autofill/core/browser/autocomplete_history_manager.cc

@@ -61,6 +61,7 @@ void AutocompleteHistoryManager::OnGetAutocompleteSuggestions(
 
   query_id_ = query_id;
   if (!autofill_client_->IsAutocompleteEnabled() ||
+      !autofill_client_->IsAutofillSupported() ||
       form_control_type == "textarea" ||
       IsInAutofillSuggestionsDisabledExperiment()) {
     SendSuggestions(nullptr);

components/autofill/core/browser/autofill_manager.cc

@@ -640,7 +640,8 @@ void AutofillManager::OnQueryFormFieldAutofillImpl(
   }
 
   // Show a "Payment not secure" message.
-  if (!is_context_secure && is_filling_credit_card && is_http_warning_enabled) {
+  if (client_->IsAutofillSupported() && !is_context_secure &&
+      is_filling_credit_card && is_http_warning_enabled) {
 #if !defined(OS_ANDROID)
     if (!suggestions.empty()) {
       suggestions.insert(suggestions.begin(), Suggestion());