Export all CWV* symbols from the ios/web_view dynamic library.

ios/web_view/public/cwv_translate_delegate.h

 // 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_TRANSLATE_DELEGATE_H_
 #define IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATE_DELEGATE_H_
 
 #import <Foundation/Foundation.h>
 
+#include "cwv_export.h"
+
 @protocol CRIWVTranslateManager;
 
 typedef NS_ENUM(NSInteger, CRIWVTransateStep) {
   CRIWVTransateStepBeforeTranslate,
   CRIWVTransateStepTranslating,
   CRIWVTransateStepAfterTranslate,
   CRIWVTransateStepError,
 };
 
 // Delegate interface for the CRIWVTranslate.  Embedders can implement the
 // functions in order to customize the behavior.
-@protocol CWVTranslateDelegate
+CWV_EXPORT @protocol CWVTranslateDelegate
 
 - (void)translateStepChanged:(CRIWVTransateStep)step
                      manager:(id<CRIWVTranslateManager>)manager;
 
 @end
 
 #endif  // IOS_WEB_VIEW_PUBLIC_CWV_TRANSLATE_DELEGATE_H_