Remove CWVDelegate.

ios/web_view/internal/web_view_web_main_delegate.h

Index: ios/web_view/internal/web_view_web_main_delegate.h
diff --git a/ios/web_view/internal/web_view_web_main_delegate.h b/ios/web_view/internal/web_view_web_main_delegate.h
index 068183f460442b9b53565c3ff58de7a4895a4a04..de7a2d7e92d37ef8dca9027cb6b4840e3d8e6969 100644
--- a/ios/web_view/internal/web_view_web_main_delegate.h
+++ b/ios/web_view/internal/web_view_web_main_delegate.h
@@ -6,27 +6,26 @@
 #define IOS_WEB_VIEW_INTERNAL_WEB_VIEW_WEB_MAIN_DELEGATE_H_
 
 #include <memory>
+#include <string>
 
 #include "base/macros.h"
 #include "ios/web/public/app/web_main_delegate.h"
 
-@protocol CWVDelegate;
-
 namespace ios_web_view {
 class WebViewWebClient;
 
 // WebView implementation of WebMainDelegate.
 class WebViewWebMainDelegate : public web::WebMainDelegate {
  public:
-  explicit WebViewWebMainDelegate(id<CWVDelegate> delegate);
+  explicit WebViewWebMainDelegate(const std::string& user_agent_product);
   ~WebViewWebMainDelegate() override;
 
   // WebMainDelegate implementation.
   void BasicStartupComplete() override;
 
  private:
-  // This object's delegate.
-  __weak id<CWVDelegate> delegate_;
+  // The name of the product to be used in the User Agent string.
+  std::string user_agent_product_;
 
   // The content and web clients registered by this object.
   std::unique_ptr<WebViewWebClient> web_client_;