Let CRIWVWebView inherit UIView instead of NSObject.

ios/web_view/internal/criwv_web_view_impl.h

Index: ios/web_view/internal/criwv_web_view_impl.h
diff --git a/ios/web_view/internal/criwv_web_view_impl.h b/ios/web_view/internal/criwv_web_view_impl.h
deleted file mode 100644
index fbd9170e9ab082c8b473e93215212f296da232d6..0000000000000000000000000000000000000000
--- a/ios/web_view/internal/criwv_web_view_impl.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2014 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.
-
-#ifndef IOS_WEB_VIEW_INTERNAL_CRIWV_WEB_VIEW_IMPL_H_
-#define IOS_WEB_VIEW_INTERNAL_CRIWV_WEB_VIEW_IMPL_H_
-
-#import "ios/web_view/public/criwv_web_view.h"
-
-namespace ios_web_view {
-class CRIWVBrowserState;
-}
-
-@interface CRIWVWebViewImpl : NSObject<CRIWVWebView>
-
-- (instancetype)init NS_UNAVAILABLE;
-
-- (instancetype)initWithBrowserState:
-    (ios_web_view::CRIWVBrowserState*)browserState NS_DESIGNATED_INITIALIZER;
-
-@end
-
-#endif  // IOS_WEB_VIEW_INTERNAL_CRIWV_WEB_VIEW_IMPL_H_