--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -13,16 +13,17 @@
 #include <stdint.h>
 
 #include "MediaDecoderStateMachine.h"
 #include "MediaDecoderStateMachineScheduler.h"
 #include "AudioSink.h"
 #include "nsTArray.h"
 #include "MediaDecoder.h"
 #include "MediaDecoderReader.h"
+#include "mozilla/MathAlgorithms.h"
 #include "mozilla/mozalloc.h"
 #include "VideoUtils.h"
 #include "mozilla/dom/TimeRanges.h"
 #include "nsDeque.h"
 #include "AudioSegment.h"
 #include "VideoSegment.h"
 #include "ImageContainer.h"
 #include "nsComponentManagerUtils.h"
@@ -160,17 +161,17 @@ static const uint32_t QUICK_BUFFERING_LO
 // QUICK_BUFFERING_LOW_DATA_USECS.
 static_assert(QUICK_BUFFERING_LOW_DATA_USECS <= AMPLE_AUDIO_USECS,
               "QUICK_BUFFERING_LOW_DATA_USECS is too large");
 
 // The amount of instability we tollerate in calls to
 // MediaDecoderStateMachine::UpdateEstimatedDuration(); changes of duration
 // less than this are ignored, as they're assumed to be the result of
 // instability in the duration estimation.
-static const int64_t ESTIMATED_DURATION_FUZZ_FACTOR_USECS = USECS_PER_S / 2;
+static const uint64_t ESTIMATED_DURATION_FUZZ_FACTOR_USECS = USECS_PER_S / 2;
 
 static TimeDuration UsecsToDuration(int64_t aUsecs) {
   return TimeDuration::FromMicroseconds(aUsecs);
 }
 
 static int64_t DurationToUsecs(TimeDuration aDuration) {
   return static_cast<int64_t>(aDuration.ToSeconds() * USECS_PER_S);
 }
@@ -1444,17 +1445,17 @@ void MediaDecoderStateMachine::SetDurati
   mEndTime = mStartTime + aDuration;
 }
 
 void MediaDecoderStateMachine::UpdateEstimatedDuration(int64_t aDuration)
 {
   AssertCurrentThreadInMonitor();
   int64_t duration = GetDuration();
   if (aDuration != duration &&
-      std::abs(aDuration - duration) > ESTIMATED_DURATION_FUZZ_FACTOR_USECS) {
+      mozilla::Abs(aDuration - duration) > ESTIMATED_DURATION_FUZZ_FACTOR_USECS) {
     SetDuration(aDuration);
     nsCOMPtr<nsIRunnable> event =
       NS_NewRunnableMethod(mDecoder, &MediaDecoder::DurationChanged);
     NS_DispatchToMainThread(event);
   }
 }
 
 void MediaDecoderStateMachine::SetMediaEndTime(int64_t aEndTime)