Bug 1688937 - Remove now-unused thread counting r=KrisWright

Depends on D103190

Differential Revision: https://phabricator.services.mozilla.com/D103191

xpcom/threads/nsThread.cpp

@@ -114,9 +114,6 @@ NS_DECL_CI_INTERFACE_GETTER(nsThread)
 
 Array<char, nsThread::kRunnableNameBufSize> nsThread::sMainThreadRunnableName;
 
-uint32_t nsThread::sActiveThreads;
-uint32_t nsThread::sMaxActiveThreads;
-
 #ifdef EARLY_BETA_OR_EARLIER
 const uint32_t kTelemetryWakeupCountLimit = 100;
 #endif
@@ -335,26 +332,16 @@ void nsThread::ClearThreadList() {
 /* static */
 nsThreadEnumerator nsThread::Enumerate() { return {}; }
 
-/* static */
-uint32_t nsThread::MaxActiveThreads() {
-  OffTheBooksMutexAutoLock mal(ThreadListMutex());
-  return sMaxActiveThreads;
-}
-
 void nsThread::AddToThreadList() {
   OffTheBooksMutexAutoLock mal(ThreadListMutex());
   MOZ_ASSERT(!isInList());
 
-  sActiveThreads++;
-  sMaxActiveThreads = std::max(sActiveThreads, sMaxActiveThreads);
-
   ThreadList().insertBack(this);
 }
 
 void nsThread::MaybeRemoveFromThreadList() {
   OffTheBooksMutexAutoLock mal(ThreadListMutex());
   if (isInList()) {
-    sActiveThreads--;
     removeFrom(ThreadList());
   }
 }

xpcom/threads/nsThread.h

@@ -238,8 +238,6 @@ class nsThread : public nsIThreadInternal,
 
   static nsThreadEnumerator Enumerate();
 
-  static uint32_t MaxActiveThreads();
-
   // When entering local execution mode a new event queue is created and used as
   // an event source. This queue is only accessible through an
   // nsLocalExecutionGuard constructed from the nsLocalExecutionRecord returned
@@ -288,11 +286,6 @@ class nsThread : public nsIThreadInternal,
   static mozilla::LinkedList<nsThread>& ThreadList();
   static void ClearThreadList();
 
-  // The current number of active threads.
-  static uint32_t sActiveThreads;
-  // The maximum current number of active threads we've had in this session.
-  static uint32_t sMaxActiveThreads;
-
   void AddToThreadList();
   void MaybeRemoveFromThreadList();
 

xpcom/threads/nsThreadManager.cpp

@@ -768,10 +768,6 @@ nsThreadManager::GetMainThreadEventTarget(nsIEventTarget** aTarget) {
   return NS_OK;
 }
 
-uint32_t nsThreadManager::GetHighestNumberOfThreads() {
-  return nsThread::MaxActiveThreads();
-}
-
 NS_IMETHODIMP
 nsThreadManager::DispatchToMainThread(nsIRunnable* aEvent, uint32_t aPriority,
                                       uint8_t aArgc) {

xpcom/threads/nsThreadManager.h

@@ -68,10 +68,6 @@ class nsThreadManager : public nsIThreadManager {
   already_AddRefed<nsISerialEventTarget> CreateBackgroundTaskQueue(
       const char* aName);
 
-  // Returns the maximal number of threads that have been in existence
-  // simultaneously during the execution of the thread manager.
-  uint32_t GetHighestNumberOfThreads();
-
   ~nsThreadManager();
 
   void EnableMainThreadEventPrioritization();