--- a/layout/style/nsTransitionManager.cpp
+++ b/layout/style/nsTransitionManager.cpp
@@ -36,16 +36,17 @@
 #include "mozilla/RestyleManagerHandleInlines.h"
 #include "nsDOMMutationObserver.h"
 
 using mozilla::TimeStamp;
 using mozilla::TimeDuration;
 using mozilla::dom::Animation;
 using mozilla::dom::AnimationPlayState;
 using mozilla::dom::CSSTransition;
+using mozilla::dom::DocumentTimeline;
 using mozilla::dom::KeyframeEffectReadOnly;
 
 using namespace mozilla;
 using namespace mozilla::css;
 
 double
 ElementPropertyTransition::CurrentValuePortion() const
 {

--- a/layout/style/nsTransitionManager.h
+++ b/layout/style/nsTransitionManager.h
@@ -201,18 +201,18 @@ public:
 
   // Return the animation current time based on a given TimeStamp, a given
   // start time and a given playbackRate on a given timeline.  This is useful
   // when we estimate the current animated value running on the compositor
   // because the animation on the compositor may be running ahead while
   // main-thread is busy.
   static Nullable<TimeDuration> GetCurrentTimeAt(
       const DocumentTimeline& aTimeline,
-      const TimeStamp& aBaseTime,
-      const TimeDuration& aStartTime,
+      const mozilla::TimeStamp& aBaseTime,
+      const mozilla::TimeDuration& aStartTime,
       double aPlaybackRate);
 
 protected:
   virtual ~CSSTransition()
   {
     MOZ_ASSERT(!mOwningElement.IsSet(), "Owning element should be cleared "
                                         "before a CSS transition is destroyed");
   }