Remove CWVDelegate.

ios/web_view/internal/web_view_web_main_delegate.mm

Index: ios/web_view/internal/web_view_web_main_delegate.mm
diff --git a/ios/web_view/internal/web_view_web_main_delegate.mm b/ios/web_view/internal/web_view_web_main_delegate.mm
index 83188ce85c46a185f0b127497b8e07011a2a7092..3160919d3a5f6fd248935e67be21cdc27752f5bd 100644
--- a/ios/web_view/internal/web_view_web_main_delegate.mm
+++ b/ios/web_view/internal/web_view_web_main_delegate.mm
@@ -7,7 +7,6 @@
 #import "base/mac/bundle_locations.h"
 #include "base/memory/ptr_util.h"
 #import "ios/web_view/internal/web_view_web_client.h"
-#import "ios/web_view/public/cwv_delegate.h"
 #import "ios/web_view/public/cwv_web_view.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -16,15 +15,16 @@
 
 namespace ios_web_view {
 
-WebViewWebMainDelegate::WebViewWebMainDelegate(id<CWVDelegate> delegate)
-    : delegate_(delegate) {}
+WebViewWebMainDelegate::WebViewWebMainDelegate(
+    const std::string& user_agent_product)
+    : user_agent_product_(user_agent_product) {}
 
 WebViewWebMainDelegate::~WebViewWebMainDelegate() = default;
 
 void WebViewWebMainDelegate::BasicStartupComplete() {
   base::mac::SetOverrideFrameworkBundle(
       [NSBundle bundleForClass:[CWVWebView class]]);
-  web_client_ = base::MakeUnique<WebViewWebClient>(delegate_);
+  web_client_ = base::MakeUnique<WebViewWebClient>(user_agent_product_);
   web::SetWebClient(web_client_.get());
 }