diff --git a/xpcom/base/nsIMemoryReporter.idl b/xpcom/base/nsIMemoryReporter.idl
index 39e3be823b1..5ff89411259 100644
--- a/xpcom/base/nsIMemoryReporter.idl
+++ b/xpcom/base/nsIMemoryReporter.idl
@@ -520,15 +520,6 @@ nsresult RegisterNonJSSizeOfTab(NonJSSizeOfTabFn aSizeOfTabFn);
 }
 
 #if defined(MOZ_DMD) && !defined(MOZILLA_XPCOMRT_API)
-namespace mozilla {
-namespace dmd {
-// This runs all the memory reporters in the current process but does nothing
-// with the results;  i.e. it does the minimal amount of work possible for DMD
-// to do its thing.  It does nothing with child processes.
-void RunReportersForThisProcess();
-}
-}
-
 #if !defined(MOZ_MEMORY)
 #error "MOZ_DMD requires MOZ_MEMORY"
 #endif
diff --git a/xpcom/base/nsMemoryReporterManager.cpp b/xpcom/base/nsMemoryReporterManager.cpp
index 5139ab2af36..69db11fc37c 100644
--- a/xpcom/base/nsMemoryReporterManager.cpp
+++ b/xpcom/base/nsMemoryReporterManager.cpp
@@ -2500,45 +2500,3 @@ DEFINE_REGISTER_SIZE_OF_TAB(NonJS);
 #undef GET_MEMORY_REPORTER_MANAGER
 
 } // namespace mozilla
-
-#if defined(MOZ_DMD)
-
-namespace mozilla {
-namespace dmd {
-
-class DoNothingCallback final : public nsIHandleReportCallback
-{
-public:
-  NS_DECL_ISUPPORTS
-
-  NS_IMETHOD Callback(const nsACString& aProcess, const nsACString& aPath,
-                      int32_t aKind, int32_t aUnits, int64_t aAmount,
-                      const nsACString& aDescription,
-                      nsISupports* aData) override
-  {
-    // Do nothing;  the reporter has already reported to DMD.
-    return NS_OK;
-  }
-
-private:
-  ~DoNothingCallback() {}
-};
-
-NS_IMPL_ISUPPORTS(DoNothingCallback, nsIHandleReportCallback)
-
-void
-RunReportersForThisProcess()
-{
-  nsCOMPtr<nsIMemoryReporterManager> mgr =
-    do_GetService("@mozilla.org/memory-reporter-manager;1");
-
-  nsRefPtr<DoNothingCallback> doNothing = new DoNothingCallback();
-
-  mgr->GetReportsForThisProcess(doNothing, nullptr, /* anonymize = */ false);
-}
-
-} // namespace dmd
-} // namespace mozilla
-
-#endif  // defined(MOZ_DMD)
-