--- a/image/imgLoader.cpp
+++ b/image/imgLoader.cpp
@@ -60,17 +60,17 @@ using namespace mozilla;
 using namespace mozilla::dom;
 using namespace mozilla::image;
 using namespace mozilla::net;
 
 MOZ_DEFINE_MALLOC_SIZE_OF(ImagesMallocSizeOf)
 
 class imgMemoryReporter final : public nsIMemoryReporter
 {
-  ~imgMemoryReporter() { }
+  ~imgMemoryReporter() = default;
 
 public:
   NS_DECL_ISUPPORTS
 
   NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
                             nsISupports* aData, bool aAnonymize) override
   {
     nsTArray<ImageMemoryCounter> chrome;

--- a/image/imgRequestProxy.cpp
+++ b/image/imgRequestProxy.cpp
@@ -18,17 +18,17 @@ using namespace mozilla::image;
 
 // The split of imgRequestProxy and imgRequestProxyStatic means that
 // certain overridden functions need to be usable in the destructor.
 // Since virtual functions can't be used in that way, this class
 // provides a behavioural trait for each class to use instead.
 class ProxyBehaviour
 {
  public:
-  virtual ~ProxyBehaviour() {}
+  virtual ~ProxyBehaviour() = default;
 
   virtual already_AddRefed<mozilla::image::Image> GetImage() const = 0;
   virtual bool HasImage() const = 0;
   virtual already_AddRefed<ProgressTracker> GetProgressTracker() const = 0;
   virtual imgRequest* GetOwner() const = 0;
   virtual void SetOwner(imgRequest* aOwner) = 0;
 };