Removed unused options in AutofillAgent::ShowSuggestionsOptions

I noticed while working on something else that
AutofillAgent::ShowSuggestionsOptions's datalist_only is never
referenced, and show_password_suggestions_only is referenced but never
set.  This change deletes both bits of dead code.

These were initially added back in 2014 via
https://codereview.chromium.org/753393004/diff/60001/components/autofill/content/renderer/autofill_agent.h
Apparently the code has shifted since then to render them unused.

Bug: 1127443
Change-Id: I52edd4864bc7441cdada2cd018073f5881b586db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406167Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Dan Clark <daniec@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#806355}

components/autofill/content/renderer/autofill_agent.cc

@@ -114,7 +114,6 @@ AutofillAgent::ShowSuggestionsOptions::ShowSuggestionsOptions()
     : autofill_on_empty_values(false),
       requires_caret_at_end(false),
       show_full_suggestion_list(false),
-      show_password_suggestions_only(false),
       autoselect_first_suggestion(false) {}
 
 AutofillAgent::AutofillAgent(content::RenderFrame* render_frame,
@@ -664,9 +663,6 @@ void AutofillAgent::ShowSuggestions(const WebFormControlElement& element,
   if (is_generation_popup_possibly_visible_)
     return;
 
-  if (options.show_password_suggestions_only)
-    return;
-
   // Password field elements should only have suggestions shown by the password
   // autofill agent.
   // The /*disable presubmit*/ comment below is used to disable a presubmit

components/autofill/content/renderer/autofill_agent.h

@@ -142,20 +142,11 @@ class AutofillAgent : public content::RenderFrameObserver,
     // after the last character in the element.
     bool requires_caret_at_end;
 
-    // Specifies that all of <datalist> suggestions and no autofill suggestions
-    // are shown. |autofill_on_empty_values| and |requires_caret_at_end| are
-    // ignored if |datalist_only| is true.
-    bool datalist_only;
-
     // Specifies that all autofill suggestions should be shown and none should
     // be elided because of the current value of |element| (relevant for inline
     // autocomplete).
     bool show_full_suggestion_list;
 
-    // Specifies that only show a suggestions box if |element| is part of a
-    // password form, otherwise show no suggestions.
-    bool show_password_suggestions_only;
-
     // Specifies that the first suggestion must be auto-selected when the
     // dropdown is shown. Enabled when the user presses ARROW_DOWN on a field.
     bool autoselect_first_suggestion;