diff --git a/browser/brave_shields/brave_shields_web_contents_observer.cc b/browser/brave_shields/brave_shields_web_contents_observer.cc
index 97c2a5729f2..f2ffe48968b 100644
--- a/browser/brave_shields/brave_shields_web_contents_observer.cc
+++ b/browser/brave_shields/brave_shields_web_contents_observer.cc
@@ -19,7 +19,6 @@
 #include "brave/components/brave_shields/common/pref_names.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/renderer_configuration.mojom.h"
-#include "components/content_settings/core/common/content_settings_utils.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/user_prefs/user_prefs.h"
@@ -29,8 +28,6 @@
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/buildflags/buildflags.h"
-#include "ipc/ipc_channel_proxy.h"
-#include "ipc/ipc_message_macros.h"
 #include "mojo/public/cpp/bindings/associated_remote.h"
 #include "third_party/blink/public/common/associated_interfaces/associated_interface_provider.h"
 
diff --git a/browser/extensions/api/brave_shields_api_browsertest.cc b/browser/extensions/api/brave_shields_api_browsertest.cc
index e427d708367..679eae21ce6 100644
--- a/browser/extensions/api/brave_shields_api_browsertest.cc
+++ b/browser/extensions/api/brave_shields_api_browsertest.cc
@@ -201,17 +201,9 @@ IN_PROC_BROWSER_TEST_F(BraveShieldsAPIBrowserTest, AllowScriptsOnceDataURL) {
       << "Scripts from a.test and data URL should be temporarily allowed.";
 }
 
-IN_PROC_BROWSER_TEST_F(BraveShieldsAPIBrowserTest, PRE_AllowScriptsOnceIframe) {
-  // Block scripts in a PRE_ test to workaround an upstream bug [1] when a spare
-  // renderer process doesn't receive ContentSettings updates after being
-  // created.
-  // Workaround should be removed when upstream will be fixed.
-  //
-  // 1. https://bugs.chromium.org/p/chromium/issues/detail?id=1294211
-  BlockScripts();
-}
-
 IN_PROC_BROWSER_TEST_F(BraveShieldsAPIBrowserTest, AllowScriptsOnceIframe) {
+  BlockScripts();
+
   EXPECT_TRUE(NavigateToURLUntilLoadStop("a.com", "/remote_iframe.html"));
   EXPECT_EQ(GetActiveRenderFrameHosts().size(), 2u)
       << "All script loadings should be blocked.";
diff --git a/chromium_src/components/content_settings/core/browser/content_settings_utils.cc b/chromium_src/components/content_settings/core/browser/content_settings_utils.cc
index c6380989c20..e44b816c3d1 100644
--- a/chromium_src/components/content_settings/core/browser/content_settings_utils.cc
+++ b/chromium_src/components/content_settings/core/browser/content_settings_utils.cc
@@ -18,14 +18,19 @@ namespace content_settings {
 void GetRendererContentSettingRules(const HostContentSettingsMap* map,
                                     RendererContentSettingRules* rules) {
   GetRendererContentSettingRules_ChromiumImpl(map, rules);
-  map->GetSettingsForOneType(ContentSettingsType::AUTOPLAY,
-                             &(rules->autoplay_rules));
-  map->GetSettingsForOneType(ContentSettingsType::BRAVE_FINGERPRINTING_V2,
-                             &(rules->fingerprinting_rules));
-  map->GetSettingsForOneType(ContentSettingsType::BRAVE_SHIELDS,
-                             &(rules->brave_shields_rules));
-  map->GetSettingsForOneType(ContentSettingsType::BRAVE_COSMETIC_FILTERING,
-                             &(rules->cosmetic_filtering_rules));
+  std::pair<ContentSettingsType, ContentSettingsForOneType*> settings[] = {
+      {ContentSettingsType::AUTOPLAY, &rules->autoplay_rules},
+      {ContentSettingsType::BRAVE_FINGERPRINTING_V2,
+       &rules->fingerprinting_rules},
+      {ContentSettingsType::BRAVE_SHIELDS, &rules->brave_shields_rules},
+      {ContentSettingsType::BRAVE_COSMETIC_FILTERING,
+       &rules->cosmetic_filtering_rules},
+  };
+  for (const auto& setting : settings) {
+    DCHECK(
+        RendererContentSettingRules::IsRendererContentSetting(setting.first));
+    map->GetSettingsForOneType(setting.first, setting.second);
+  }
 }
 
 }  // namespace content_settings