Remove deprecated method getKeyboardAccessory.

BUG=

Review URL: https://codereview.chromium.org/1363633002

Cr-Commit-Position: refs/heads/master@{#350255}

ios/web/public/web_state/crw_web_view_proxy.h

@@ -48,11 +48,6 @@
 // Returns YES if it makes sense to search for text right now.
 - (BOOL)hasSearchableTextContent;
 
-// Returns the currently visible keyboard accessory, or nil.
-// TODO(jdonnelly): Remove this once downstream code is updated to use
-// keyboardAccessory.
-- (UIView*)getKeyboardAccessory;
-
 // Returns the currently visible keyboard accessory, or nil.
 - (UIView*)keyboardAccessory;
 

ios/web/web_state/crw_web_view_proxy_impl.mm

@@ -138,10 +138,6 @@ UIView* GetFirstResponderSubview(UIView* view) {
   return _contentView != nil && [_webController contentIsHTML];
 }
 
-- (UIView*)getKeyboardAccessory {
-  return [self keyboardAccessory];
-}
-
 - (UIView*)keyboardAccessory {
   if (!_contentView)
     return nil;