Bug 1794536 - Delete MemoryTelemetry::GetUniqueSetSize() and its decleration. r=pbone

Differential Revision: https://phabricator.services.mozilla.com/D160425

xpcom/base/MemoryTelemetry.cpp

@@ -486,25 +486,6 @@ nsresult MemoryTelemetry::FinishGatheringTotalMemory(
   return total;
 }
 
-void MemoryTelemetry::GetUniqueSetSize(
-    std::function<void(const int64_t&)>&& aCallback) {
-  mThreadPool->Dispatch(
-      NS_NewRunnableFunction(
-          "MemoryTelemetry::GetUniqueSetSize",
-          [callback = std::move(aCallback)]() mutable {
-            RefPtr<nsMemoryReporterManager> mgr =
-                nsMemoryReporterManager::GetOrCreate();
-            MOZ_RELEASE_ASSERT(mgr);
-
-            int64_t uss = mgr->ResidentUnique();
-
-            NS_DispatchToMainThread(NS_NewRunnableFunction(
-                "MemoryTelemetry::GetUniqueSetSizeResult",
-                [uss, callback = std::move(callback)]() { callback(uss); }));
-          }),
-      NS_DISPATCH_NORMAL);
-}
-
 nsresult MemoryTelemetry::Observe(nsISupports* aSubject, const char* aTopic,
                                   const char16_t* aData) {
   if (strcmp(aTopic, kTopicCycleCollectorBegin) == 0) {

xpcom/base/MemoryTelemetry.h

@@ -39,8 +39,6 @@ class MemoryTelemetry final : public nsIObserver,
   nsresult GatherReports(
       const std::function<void()>& aCompletionCallback = nullptr);
 
-  void GetUniqueSetSize(std::function<void(const int64_t&)>&& aCallback);
-
   /**
    * Does expensive initialization, which should happen only after startup has
    * completed, and the event loop is idle.