[ABANDONED] [WIP] Refactor SafeBrowsingResourceThrottle in preparation for WebSocket

chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
index 0d8316eed6fea7513c43009212d015ce7de86141..bcf0912d20a2295fd41fa7c843b4b9cd62531626 100644
--- a/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
@@ -55,6 +55,7 @@
 #include "components/previews/core/previews_io_data.h"
 #include "components/rappor/public/rappor_utils.h"
 #include "components/rappor/rappor_service_impl.h"
+#include "components/safe_browsing/resource_throttle.h"
 #include "components/search_engines/template_url_service.h"
 #include "components/variations/net/variations_http_headers.h"
 #include "content/public/browser/browser_thread.h"
@@ -651,21 +652,22 @@ void ChromeResourceDispatcherHostDelegate::AppendStandardResourceThrottles(
 
   // Insert either safe browsing or data reduction proxy throttle at the front
   // of the list, so one of them gets to decide if the resource is safe.
-  content::ResourceThrottle* first_throttle = NULL;
+  std::unique_ptr<content::ResourceThrottle> first_throttle;
 #if defined(OS_ANDROID)
-  first_throttle = DataReductionProxyResourceThrottle::MaybeCreate(
-      request, resource_context, resource_type, safe_browsing_.get());
+  first_throttle =
+      base::WrapUnique(DataReductionProxyResourceThrottle::MaybeCreate(
+          request, resource_context, resource_type, safe_browsing_.get()));
 #endif  // defined(OS_ANDROID)
 
 #if defined(SAFE_BROWSING_DB_LOCAL) || defined(SAFE_BROWSING_DB_REMOTE)
   if (!first_throttle && io_data->safe_browsing_enabled()->GetValue()) {
-    first_throttle = SafeBrowsingResourceThrottle::MaybeCreate(
+    first_throttle = MaybeCreateSafeBrowsingResourceThrottle(
         request, resource_type, safe_browsing_.get());
   }
 #endif  // defined(SAFE_BROWSING_DB_LOCAL) || defined(SAFE_BROWSING_DB_REMOTE)
 
   if (first_throttle)
-    throttles->push_back(base::WrapUnique(first_throttle));
+    throttles->push_back(std::move(first_throttle));
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   content::ResourceThrottle* wait_for_extensions_init_throttle =