Remove deprecated method getKeyboardAccessory.

ios/web/web_state/crw_web_view_proxy_impl.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/web_state/crw_web_view_proxy_impl.h"
 
 #include "base/ios/ios_util.h"
 #include "base/ios/weak_nsobject.h"
 #include "base/mac/scoped_nsobject.h"
 #import "ios/web/public/web_state/crw_web_view_scroll_view_proxy.h"
@@ skipping 120 matching lines @@
 }
 
 - (void)addSubview:(UIView*)view {
   return [_contentView addSubview:view];
 }
 
 - (BOOL)hasSearchableTextContent {
   return _contentView != nil && [_webController contentIsHTML];
 }
 
-- (UIView*)getKeyboardAccessory {
-  return [self keyboardAccessory];
-}
-
 - (UIView*)keyboardAccessory {
   if (!_contentView)
     return nil;
   UIView* firstResponder = GetFirstResponderSubview(_contentView);
   return firstResponder.inputAccessoryView;
 }
 
 #if defined(__IPHONE_9_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_9_0
 - (UITextInputAssistantItem*)inputAssistantItem {
   DCHECK(base::ios::IsRunningOnIOS9OrLater())
       << "Cannot retrieve inputAssistantItem on iOS versions earlier than 9.";
   if (!_contentView)
     return nil;
   UIView* firstResponder = GetFirstResponderSubview(_contentView);
   return firstResponder.inputAssistantItem;
 }
 #endif
 
 - (BOOL)keyboardDisplayRequiresUserAction {
   return [_webController keyboardDisplayRequiresUserAction];
 }
 
 - (void)setKeyboardDisplayRequiresUserAction:
         (BOOL)keyboardDisplayRequiresUserAction {
   [_webController
       setKeyboardDisplayRequiresUserAction:keyboardDisplayRequiresUserAction];
 }
 
 @end