--- a/dom/audiochannel/AudioChannelService.cpp
+++ b/dom/audiochannel/AudioChannelService.cpp
@@ -198,23 +198,16 @@ AudioChannelService::CreateServiceIfNeed
 {
   MOZ_ASSERT(NS_IsMainThread());
 
   if (!gAudioChannelService) {
     gAudioChannelService = new AudioChannelService();
   }
 }
 
-/* static */ bool
-AudioChannelService::IsServiceStarted()
-{
-  // The service would start when the first AudioChannelAgent is created.
-  return !!gAudioChannelService;
-}
-
 /* static */ already_AddRefed<AudioChannelService>
 AudioChannelService::GetOrCreate()
 {
   if (sXPCOMShuttingDown) {
     return nullptr;
   }
 
   CreateServiceIfNeeded();

--- a/dom/audiochannel/AudioChannelService.h
+++ b/dom/audiochannel/AudioChannelService.h
@@ -101,18 +101,16 @@ public:
   static already_AddRefed<AudioChannelService> Get();
 
   static bool IsAudioChannelMutedByDefault();
 
   static PRLogModuleInfo* GetAudioChannelLog();
 
   static bool IsEnableAudioCompeting();
 
-  static bool IsServiceStarted();
-
   /**
    * Any audio channel agent that starts playing should register itself to
    * this service, sharing the AudioChannel.
    */
   void RegisterAudioChannelAgent(AudioChannelAgent* aAgent,
                                  AudibleState aAudible);
 
   /**

--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -4236,18 +4236,17 @@ nsPIDOMWindowOuter::MaybeActiveMediaComp
   }
 
   nsCOMPtr<nsIDocument> doc = inner->GetExtantDoc();
   if (!doc) {
     return;
   }
 
   if (!doc->Hidden() &&
-      mMediaSuspend == nsISuspendedTypes::SUSPENDED_BLOCK &&
-      AudioChannelService::IsServiceStarted()) {
+      mMediaSuspend == nsISuspendedTypes::SUSPENDED_BLOCK) {
     SetMediaSuspend(nsISuspendedTypes::NONE_SUSPENDED);
   }
 }
 
 SuspendTypes
 nsPIDOMWindowOuter::GetMediaSuspend() const
 {
   if (IsInnerWindow()) {