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

ios/web_view/public/cwv_web_view_configuration.h

Index: ios/web_view/public/cwv_web_view_configuration.h
diff --git a/ios/web_view/public/cwv_web_view_configuration.h b/ios/web_view/public/cwv_web_view_configuration.h
index a2a7489b3c4cfe52c9aecddae946bd731bdc8f4d..a8a32e8cf5175732d8386d5a9d68eb4eec1512aa 100644
--- a/ios/web_view/public/cwv_web_view_configuration.h
+++ b/ios/web_view/public/cwv_web_view_configuration.h
@@ -7,10 +7,12 @@
 
 #import <Foundation/Foundation.h>
 
+#include "cwv_export.h"
+
 @class CWVWebsiteDataStore;
 
 // Configuration used for creation of a CWVWebView.
-@interface CWVWebViewConfiguration : NSObject<NSCopying>
+CWV_EXPORT @interface CWVWebViewConfiguration : NSObject<NSCopying>
 
 // Configuration with persistent data store which stores all data on disk.
 + (instancetype)defaultConfiguration;