Introduce AsyncDocumentSubresourceFilter.

components/subresource_filter/content/common/document_subresource_filter.cc

Index: components/subresource_filter/content/common/document_subresource_filter.cc
diff --git a/components/subresource_filter/content/common/document_subresource_filter.cc b/components/subresource_filter/content/common/document_subresource_filter.cc
index af7bbba38742024c69ca64fe1f4e3b5af22696f7..2cf099de0ea00c481c796ba75265a5fc90708425 100644
--- a/components/subresource_filter/content/common/document_subresource_filter.cc
+++ b/components/subresource_filter/content/common/document_subresource_filter.cc
@@ -155,30 +155,29 @@ DocumentSubresourceFilter::DocumentSubresourceFilter(
 
 DocumentSubresourceFilter::~DocumentSubresourceFilter() = default;
 
-blink::WebDocumentSubresourceFilter::LoadPolicy
-DocumentSubresourceFilter::getLoadPolicy(
+DocumentSubresourceFilter::LoadPolicy DocumentSubresourceFilter::getLoadPolicy(
     const blink::WebURL& resourceUrl,
     blink::WebURLRequest::RequestContext request_context) {
   ++statistics_.num_loads_total;
 
   if (activation_state_.filtering_disabled_for_document)
-    return Allow;
+    return LoadPolicy::Allow;
   if (resourceUrl.protocolIs(url::kDataScheme))
-    return Allow;
+    return LoadPolicy::Allow;
 
   // TODO(pkalinnikov): Would be good to avoid converting to GURL.
   return EvaluateLoadPolicy(GURL(resourceUrl), ToElementType(request_context));
 }
 
-blink::WebDocumentSubresourceFilter::LoadPolicy
+DocumentSubresourceFilter::LoadPolicy
 DocumentSubresourceFilter::GetLoadPolicyForSubdocument(
     const GURL& subdocument_url) {
   ++statistics_.num_loads_total;
 
   if (activation_state_.filtering_disabled_for_document)
-    return Allow;
+    return LoadPolicy::Allow;
   if (subdocument_url.SchemeIs(url::kDataScheme))
-    return Allow;
+    return LoadPolicy::Allow;
   return EvaluateLoadPolicy(subdocument_url, proto::ELEMENT_TYPE_SUBDOCUMENT);
 }
 
@@ -188,7 +187,7 @@ void DocumentSubresourceFilter::reportDisallowedLoad() {
   std::move(first_disallowed_load_callback_).Run();
 }
 
-blink::WebDocumentSubresourceFilter::LoadPolicy
+DocumentSubresourceFilter::LoadPolicy
 DocumentSubresourceFilter::EvaluateLoadPolicy(const GURL& resource_url,
                                               proto::ElementType element_type) {
   TRACE_EVENT1("loader", "DocumentSubresourceFilter::EvaluateLoadPolicy", "url",
@@ -217,12 +216,12 @@ DocumentSubresourceFilter::EvaluateLoadPolicy(const GURL& resource_url,
     ++statistics_.num_loads_matching_rules;
     if (activation_state_.activation_level == ActivationLevel::ENABLED) {
       ++statistics_.num_loads_disallowed;
-      return Disallow;
+      return LoadPolicy::Disallow;
     } else if (activation_state_.activation_level == ActivationLevel::DRYRUN) {
-      return WouldDisallow;
+      return LoadPolicy::WouldDisallow;
     }
   }
-  return Allow;
+  return LoadPolicy::Allow;
 }
 
 }  // namespace subresource_filter