diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index 450e78912408..b59060e25386 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -2687,7 +2687,7 @@ WarnIfSandboxIneffective(nsIDocShell* aDocShell,
 }
 
 bool
-nsDocument::IsSynthesized() {
+nsIDocument::IsSynthesized() {
   nsCOMPtr<nsIHttpChannelInternal> internalChan = do_QueryInterface(mChannel);
   bool synthesized = false;
   if (internalChan) {
@@ -12250,7 +12250,7 @@ ReportExternalResourceUseCounters(nsIDocument* aDocument, void* aData)
 }
 
 void
-nsDocument::ReportUseCounters(UseCounterReportKind aKind)
+nsIDocument::ReportUseCounters(UseCounterReportKind aKind)
 {
   static const bool sDebugUseCounters = false;
   if (mReportedUseCounters) {
diff --git a/dom/base/nsDocument.h b/dom/base/nsDocument.h
index 17986633f57f..e3a6ea2a1770 100644
--- a/dom/base/nsDocument.h
+++ b/dom/base/nsDocument.h
@@ -206,22 +206,6 @@ public:
   nsRadioGroupStruct* GetRadioGroup(const nsAString& aName) const;
   nsRadioGroupStruct* GetOrCreateRadioGroup(const nsAString& aName);
 
-  enum class UseCounterReportKind {
-    // Flush the document's use counters only; the use counters for any
-    // external resource documents will be flushed when the external
-    // resource documents themselves are destroyed.
-    eDefault,
-
-    // Flush use counters for the document and for its external resource
-    // documents. (Should only be necessary for tests, where we need
-    // flushing to happen synchronously and deterministically.)
-    eIncludeExternalResources,
-  };
-
-  void ReportUseCounters(UseCounterReportKind aKind = UseCounterReportKind::eDefault);
-
-  bool IsSynthesized();
-
   // Check whether shadow DOM is enabled for the global of aObject.
   static bool IsShadowDOMEnabled(JSContext* aCx, JSObject* aObject);
   // Check whether shadow DOM is enabled for the document this node belongs to.
diff --git a/dom/base/nsIDocument.h b/dom/base/nsIDocument.h
index 8eb049fdfc02..c07399b2d7a9 100644
--- a/dom/base/nsIDocument.h
+++ b/dom/base/nsIDocument.h
@@ -3488,6 +3488,22 @@ public:
 
   bool DidFireDOMContentLoaded() const { return mDidFireDOMContentLoaded; }
 
+  bool IsSynthesized();
+
+  enum class UseCounterReportKind {
+    // Flush the document's use counters only; the use counters for any
+    // external resource documents will be flushed when the external
+    // resource documents themselves are destroyed.
+    eDefault,
+
+    // Flush use counters for the document and for its external resource
+    // documents. (Should only be necessary for tests, where we need
+    // flushing to happen synchronously and deterministically.)
+    eIncludeExternalResources,
+  };
+
+  void ReportUseCounters(UseCounterReportKind aKind = UseCounterReportKind::eDefault);
+
   void SetDocumentUseCounter(mozilla::UseCounter aUseCounter)
   {
     if (!mUseCounters[aUseCounter]) {