Remove CWVDelegate.

ios/web_view/public/cwv_delegate.h

Index: ios/web_view/public/cwv_delegate.h
diff --git a/ios/web_view/public/cwv_delegate.h b/ios/web_view/public/cwv_delegate.h
deleted file mode 100644
index fff60ec3a02fdc0ca1619c38578dcc543aa599a4..0000000000000000000000000000000000000000
--- a/ios/web_view/public/cwv_delegate.h
+++ /dev/null
@@ -1,21 +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_PUBLIC_CWV_DELEGATE_H_
-#define IOS_WEB_VIEW_PUBLIC_CWV_DELEGATE_H_
-
-#import <ChromeWebView/cwv_export.h>
-
-@class NSString;
-
-// Delegate interface for the CWV library.  Embedders can implement the
-// functions in order to customize library behavior.
-CWV_EXPORT
-@protocol CWVDelegate
-
-// Returns a partial user agent of the form "ProductName/Version".
-- (NSString*)partialUserAgent;
-
-@end
-
-#endif  // IOS_WEB_VIEW_PUBLIC_CWV_DELEGATE_H_