Remove unused autofill methods

These methods turned out to be unnecessary, as the autofill agent
communicates directly with the WebAXObject.

Bug: 865101
Change-Id: Id16a03b808f76b0f2fd5030f5ba9f7ffdd119565
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731290Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684358}

third_party/blink/renderer/core/accessibility/ax_object_cache.h

@@ -108,7 +108,6 @@ class CORE_EXPORT AXObjectCache
   virtual void HandleLoadComplete(Document*) = 0;
   virtual void HandleLayoutComplete(Document*) = 0;
   virtual void HandleClicked(Node*) = 0;
-  virtual void HandleAutofillStateChanged(Element*, bool) = 0;
   virtual void HandleValidationMessageVisibilityChanged(
       const Element* form_control) = 0;
 

third_party/blink/renderer/modules/accessibility/ax_object_cache_impl.cc

@@ -1323,12 +1323,6 @@ void AXObjectCacheImpl::HandleAttributeChangedWithCleanLayout(
   }
 }
 
-void AXObjectCacheImpl::HandleAutofillStateChanged(Element* elem,
-                                                   bool is_available) {
-  if (AXObject* obj = Get(elem))
-    obj->HandleAutofillStateChanged(is_available);
-}
-
 AXObject* AXObjectCacheImpl::GetOrCreateValidationMessageObject() {
   AXObject* message_ax_object = nullptr;
   // Create only if it does not already exist.

third_party/blink/renderer/modules/accessibility/ax_object_cache_impl.h

@@ -117,7 +117,6 @@ class MODULES_EXPORT AXObjectCacheImpl
 
   bool HandleAttributeChanged(const QualifiedName& attr_name,
                               Element*) override;
-  void HandleAutofillStateChanged(Element*, bool) override;
   void HandleValidationMessageVisibilityChanged(
       const Element* form_control) override;
   void HandleFocusedUIElementChanged(Element* old_focused_element,