diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index 098340e912ae..5925426f3d14 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -8770,65 +8770,6 @@ nsContentUtils::GetWindowRoot(nsIDocument* aDoc)
   return nullptr;
 }
 
-/* static */
-nsContentPolicyType
-nsContentUtils::InternalContentPolicyTypeToExternal(nsContentPolicyType aType)
-{
-  switch (aType) {
-  case nsIContentPolicy::TYPE_INTERNAL_SCRIPT:
-  case nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD:
-  case nsIContentPolicy::TYPE_INTERNAL_WORKER:
-  case nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER:
-  case nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER:
-  case nsIContentPolicy::TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS:
-    return nsIContentPolicy::TYPE_SCRIPT;
-
-  case nsIContentPolicy::TYPE_INTERNAL_EMBED:
-  case nsIContentPolicy::TYPE_INTERNAL_OBJECT:
-    return nsIContentPolicy::TYPE_OBJECT;
-
-  case nsIContentPolicy::TYPE_INTERNAL_FRAME:
-  case nsIContentPolicy::TYPE_INTERNAL_IFRAME:
-    return nsIContentPolicy::TYPE_SUBDOCUMENT;
-
-  case nsIContentPolicy::TYPE_INTERNAL_AUDIO:
-  case nsIContentPolicy::TYPE_INTERNAL_VIDEO:
-  case nsIContentPolicy::TYPE_INTERNAL_TRACK:
-    return nsIContentPolicy::TYPE_MEDIA;
-
-  case nsIContentPolicy::TYPE_INTERNAL_XMLHTTPREQUEST:
-  case nsIContentPolicy::TYPE_INTERNAL_EVENTSOURCE:
-    return nsIContentPolicy::TYPE_XMLHTTPREQUEST;
-
-  case nsIContentPolicy::TYPE_INTERNAL_IMAGE:
-  case nsIContentPolicy::TYPE_INTERNAL_IMAGE_PRELOAD:
-  case nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON:
-    return nsIContentPolicy::TYPE_IMAGE;
-
-  case nsIContentPolicy::TYPE_INTERNAL_STYLESHEET:
-  case nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD:
-    return nsIContentPolicy::TYPE_STYLESHEET;
-
-  default:
-    return aType;
-  }
-}
-
-/* static */
-nsContentPolicyType
-nsContentUtils::InternalContentPolicyTypeToExternalOrWorker(nsContentPolicyType aType)
-{
-  switch (aType) {
-  case nsIContentPolicy::TYPE_INTERNAL_WORKER:
-  case nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER:
-  case nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER:
-    return aType;
-
-  default:
-    return InternalContentPolicyTypeToExternal(aType);
-  }
-}
-
 /* static */
 bool
 nsContentUtils::IsPreloadType(nsContentPolicyType aType)
diff --git a/dom/base/nsContentUtils.h b/dom/base/nsContentUtils.h
index 984b0d2e521e..6852ef009aa1 100644
--- a/dom/base/nsContentUtils.h
+++ b/dom/base/nsContentUtils.h
@@ -1160,7 +1160,8 @@ public:
   /**
    * Map internal content policy types to external ones.
    */
-  static nsContentPolicyType InternalContentPolicyTypeToExternal(nsContentPolicyType aType);
+  static inline nsContentPolicyType
+    InternalContentPolicyTypeToExternal(nsContentPolicyType aType);
 
   /**
    * Map internal content policy types to external ones or preload types:
@@ -1170,7 +1171,8 @@ public:
    *
    * Note: DO NOT call this function unless you know what you're doing!
    */
-  static nsContentPolicyType InternalContentPolicyTypeToExternalOrPreload(nsContentPolicyType aType);
+  static inline nsContentPolicyType
+    InternalContentPolicyTypeToExternalOrPreload(nsContentPolicyType aType);
 
   /**
    * Map internal content policy types to external ones, worker, or preload types:
@@ -3109,6 +3111,65 @@ private:
   static mozilla::LazyLogModule sDOMDumpLog;
 };
 
+/* static */ inline
+nsContentPolicyType
+nsContentUtils::InternalContentPolicyTypeToExternal(nsContentPolicyType aType)
+{
+  switch (aType) {
+  case nsIContentPolicy::TYPE_INTERNAL_SCRIPT:
+  case nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD:
+  case nsIContentPolicy::TYPE_INTERNAL_WORKER:
+  case nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER:
+  case nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER:
+  case nsIContentPolicy::TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS:
+    return nsIContentPolicy::TYPE_SCRIPT;
+
+  case nsIContentPolicy::TYPE_INTERNAL_EMBED:
+  case nsIContentPolicy::TYPE_INTERNAL_OBJECT:
+    return nsIContentPolicy::TYPE_OBJECT;
+
+  case nsIContentPolicy::TYPE_INTERNAL_FRAME:
+  case nsIContentPolicy::TYPE_INTERNAL_IFRAME:
+    return nsIContentPolicy::TYPE_SUBDOCUMENT;
+
+  case nsIContentPolicy::TYPE_INTERNAL_AUDIO:
+  case nsIContentPolicy::TYPE_INTERNAL_VIDEO:
+  case nsIContentPolicy::TYPE_INTERNAL_TRACK:
+    return nsIContentPolicy::TYPE_MEDIA;
+
+  case nsIContentPolicy::TYPE_INTERNAL_XMLHTTPREQUEST:
+  case nsIContentPolicy::TYPE_INTERNAL_EVENTSOURCE:
+    return nsIContentPolicy::TYPE_XMLHTTPREQUEST;
+
+  case nsIContentPolicy::TYPE_INTERNAL_IMAGE:
+  case nsIContentPolicy::TYPE_INTERNAL_IMAGE_PRELOAD:
+  case nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON:
+    return nsIContentPolicy::TYPE_IMAGE;
+
+  case nsIContentPolicy::TYPE_INTERNAL_STYLESHEET:
+  case nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD:
+    return nsIContentPolicy::TYPE_STYLESHEET;
+
+  default:
+    return aType;
+  }
+}
+
+/* static */ inline
+nsContentPolicyType
+nsContentUtils::InternalContentPolicyTypeToExternalOrWorker(nsContentPolicyType aType)
+{
+  switch (aType) {
+  case nsIContentPolicy::TYPE_INTERNAL_WORKER:
+  case nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER:
+  case nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER:
+    return aType;
+
+  default:
+    return InternalContentPolicyTypeToExternal(aType);
+  }
+}
+
 class MOZ_RAII nsAutoScriptBlocker {
 public:
   explicit nsAutoScriptBlocker(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM) {