Bug 1512456 - P4. Replace assert with MOZ_ASSERT. r=alwu

Differential Revision: https://phabricator.services.mozilla.com/D14027

--HG--
extra : moz-landing-system : lando

dom/media/webm/WebMDemuxer.cpp

@@ -760,7 +760,7 @@ nsresult WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType,
             encrypted = !encrypted;
             lastOffset = partition;
 
-            assert(lastOffset <= length);
+            MOZ_ASSERT(lastOffset <= length);
           }
 
           // Add the data between the last offset and the end of the data.
@@ -787,7 +787,7 @@ nsresult WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType,
 
           // Assert that the lengths of the encrypted and plain samples add to
           // the length of the data.
-          assert(
+          MOZ_ASSERT(
               ((size_t)(std::accumulate(writer->mCrypto.mPlainSizes.begin(),
                                         writer->mCrypto.mPlainSizes.end(), 0) +
                         std::accumulate(writer->mCrypto.mEncryptedSizes.begin(),