[iOS] Change URL blocking check

The URL blocking check should actually check if the URL might be blocked
instead of checking for the feature being enabled.

Bug: 1073932
Change-Id: Idd3cc76fa04e6db45fb2eab3e3ee9dc674705834
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2230480
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775060}

ios/chrome/browser/web/chrome_web_client.mm

@@ -346,8 +346,5 @@ web::UserAgentType ChromeWebClient::GetDefaultUserAgent(
 }
 
 bool ChromeWebClient::IsEmbedderBlockRestoreUrlEnabled() {
-  if (@available(iOS 13, *)) {
-    return base::FeatureList::IsEnabled(kEmbedderBlockRestoreUrl);
-  }
-  return false;
+  return ios::GetChromeBrowserProvider()->MightBlockUrlDuringRestore();
 }

ios/public/provider/chrome/browser/chrome_browser_provider.h

@@ -118,6 +118,10 @@ class ChromeBrowserProvider {
   virtual void AddSerializableData(
       web::SerializableUserDataManager* user_data_manager,
       web::WebState* web_state);
+
+  // Whether the embedder might block specific URL.
+  virtual bool MightBlockUrlDuringRestore();
+
   // Allow embedders to block a specific URL.
   virtual bool ShouldBlockUrlDuringRestore(const GURL& url,
                                            web::WebState* web_state);

ios/public/provider/chrome/browser/chrome_browser_provider.mm

@@ -76,6 +76,10 @@ void ChromeBrowserProvider::AddSerializableData(
     web::SerializableUserDataManager* user_data_manager,
     web::WebState* web_state) {}
 
+bool ChromeBrowserProvider::MightBlockUrlDuringRestore() {
+  return false;
+}
+
 bool ChromeBrowserProvider::ShouldBlockUrlDuringRestore(
     const GURL& url,
     web::WebState* web_state) {