Remove CWVDelegate.

ios/web_view/internal/web_view_web_main_parts.h

Index: ios/web_view/internal/web_view_web_main_parts.h
diff --git a/ios/web_view/internal/web_view_web_main_parts.h b/ios/web_view/internal/web_view_web_main_parts.h
index 185caf95e36f317656bbd5e67e4c83ad2fc36013..94fe9e649aed327128dda83fe720271027d445d0 100644
--- a/ios/web_view/internal/web_view_web_main_parts.h
+++ b/ios/web_view/internal/web_view_web_main_parts.h
@@ -17,7 +17,7 @@ class WebViewBrowserState;
 // WebView implementation of WebMainParts.
 class WebViewWebMainParts : public web::WebMainParts {
  public:
-  explicit WebViewWebMainParts(id<CWVDelegate> delegate);
+  WebViewWebMainParts();
   ~WebViewWebMainParts() override;
 
   // WebMainParts implementation.
@@ -32,9 +32,6 @@ class WebViewWebMainParts : public web::WebMainParts {
   }
 
  private:
-  // This object's delegate.
-  __weak id<CWVDelegate> delegate_;
-
   // The BrowserState for this embedder.
   std::unique_ptr<WebViewBrowserState> browser_state_;