Moved WebView(ScrollView)Proxy files to ui subdirectory.

ios/web/web_state/ui/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"
+#import "ios/web/web_state/ui/crw_web_view_proxy_impl.h"
 
 #import "base/mac/scoped_nsobject.h"
-#import "ios/web/public/web_state/crw_web_view_scroll_view_proxy.h"
 #import "ios/web/public/web_state/ui/crw_content_view.h"
+#import "ios/web/public/web_state/ui/crw_web_view_scroll_view_proxy.h"
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 
 // Returns the first responder in the subviews of |view|, or nil if no view in
 // the subtree is the first responder.
@@ skipping 153 matching lines @@
     return nil;
   UIView* firstResponder = GetFirstResponderSubview(_contentView);
   return firstResponder.inputAssistantItem;
 }
 
 - (BOOL)becomeFirstResponder {
   return [_contentView becomeFirstResponder];
 }
 
 @end