--- a/dom/media/gmp/GMPCDMProxy.cpp
+++ b/dom/media/gmp/GMPCDMProxy.cpp
@@ -719,25 +719,24 @@ void
 GMPCDMProxy::gmp_Decrypted(uint32_t aId,
                            DecryptStatus aResult,
                            const nsTArray<uint8_t>& aDecryptedData)
 {
   MOZ_ASSERT(IsOnOwnerThread());
 #ifdef DEBUG
   bool jobIdFound = false;
 #endif
-  for (size_t i = 0; i < mDecryptionJobs.Length(); i++) {
-    DecryptJob* job = mDecryptionJobs[i];
+  for (auto& job : mDecryptionJobs) {
     if (job->mId == aId) {
 #ifdef DEBUG
       jobIdFound = true;
 #endif
       job->PostResult(aResult, aDecryptedData);
-      mDecryptionJobs.RemoveElementAt(i);
     }
+    mDecryptionJobs.Clear();
   }
 #ifdef DEBUG
   if (!jobIdFound) {
     NS_WARNING("GMPDecryptorChild returned incorrect job ID");
   }
 #endif
 }