Replace blink event enums with ax::mojom::Event

This removes some unnecessary abstractions and helps
with mojoification of Blink accessibility, and eventually
will help us to remove all of the code in
content/renderer/accessibility.

Bug: 882660

Change-Id: I6170c78abbfbe57972d15b73fb2fd33523472bec
Reviewed-on: https://chromium-review.googlesource.com/1217906
Reviewed-by: Alice Boxhall <[email protected]>
Reviewed-by: Kentaro Hara <[email protected]>
Commit-Queue: Dominic Mazzoni <[email protected]>
Cr-Commit-Position: refs/heads/master@{#590786}
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index d5ad634..0240d4a 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -337,7 +337,7 @@
   bool in_frame_tree() { return in_frame_tree_; }
 
   void HandleWebAccessibilityEvent(const blink::WebAXObject& obj,
-                                   blink::WebAXEvent event);
+                                   ax::mojom::Event event);
 
   // The focused node changed to |node|. If focus was lost from this frame,
   // |node| will be null.
@@ -720,7 +720,7 @@
   bool AllowContentInitiatedDataUrlNavigations(
       const blink::WebURL& url) override;
   void PostAccessibilityEvent(const blink::WebAXObject& obj,
-                              blink::WebAXEvent event) override;
+                              ax::mojom::Event event) override;
   void HandleAccessibilityFindInPageResult(int identifier,
                                            int match_index,
                                            const blink::WebNode& start_node,