[Android][TouchToFill] Use FindPasswordInfoForElement for triggering

Use for TouchToFill the same triggering logic that is used for regular
suggestions.

Bug: 1010233
Change-Id: I111d4eac4ce94dd94b86097b6b6c98e08875e11a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834230
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702058}
PasswordAutofillAgent::GetPasswordFormFromUnownedInputElements() {
  content::RenderFrame* frame = render_frame();
  if (!frame)
    return nullptr;
  WebLocalFrame* web_frame = frame->GetWebFrame();
  if (!web_frame)
    return nullptr;
  return CreateSimplifiedPasswordFormFromUnownedInputElements(
      *web_frame, &field_data_manager_, &username_detector_cache_);
}

PasswordAutofillAgent::GetPasswordFormFromUnownedInputElements() {
  content::RenderFrame* frame = render_frame();
  if (!frame)
    return nullptr;
  WebLocalFrame* web_frame = frame->GetWebFrame();
  if (!web_frame)
    return nullptr;
  return CreateSimplifiedPasswordFormFromUnownedInputElements(
      *web_frame, &field_data_manager_, &username_detector_cache_);
}
