diff --git a/dom/indexedDB/IDBObjectStore.cpp b/dom/indexedDB/IDBObjectStore.cpp
index 24a34a464100..a54f874d529c 100644
--- a/dom/indexedDB/IDBObjectStore.cpp
+++ b/dom/indexedDB/IDBObjectStore.cpp
@@ -39,7 +39,6 @@
 #include "mozilla/dom/StructuredCloneTags.h"
 #include "mozilla/dom/indexedDB/PBackgroundIDBSharedTypes.h"
 #include "mozilla/dom/ipc/BlobChild.h"
-#include "mozilla/dom/ipc/nsIRemoteBlob.h"
 #include "mozilla/ipc/BackgroundChild.h"
 #include "mozilla/ipc/PBackgroundSharedTypes.h"
 #include "nsCOMPtr.h"
@@ -428,32 +427,6 @@ GetAddInfoCallback(JSContext* aCx, void* aClosure)
   return NS_OK;
 }
 
-BlobChild*
-ActorFromRemoteBlobImpl(BlobImpl* aImpl)
-{
-  MOZ_ASSERT(aImpl);
-
-  nsCOMPtr<nsIRemoteBlob> remoteBlob = do_QueryInterface(aImpl);
-  if (remoteBlob) {
-    BlobChild* actor = remoteBlob->GetBlobChild();
-    MOZ_ASSERT(actor);
-
-    if (actor->GetContentManager()) {
-      return nullptr;
-    }
-
-    MOZ_ASSERT(actor->GetBackgroundManager());
-    MOZ_ASSERT(BackgroundChild::GetForCurrentThread());
-    MOZ_ASSERT(actor->GetBackgroundManager() ==
-                 BackgroundChild::GetForCurrentThread(),
-               "Blob actor is not bound to this thread!");
-
-    return actor;
-  }
-
-  return nullptr;
-}
-
 bool
 ResolveMysteryMutableFile(IDBMutableFile* aMutableFile,
                           const nsString& aName,
@@ -464,33 +437,6 @@ ResolveMysteryMutableFile(IDBMutableFile* aMutableFile,
   return true;
 }
 
-bool
-ResolveMysteryFile(BlobImpl* aImpl,
-                   const nsString& aName,
-                   const nsString& aContentType,
-                   uint64_t aSize,
-                   uint64_t aLastModifiedDate)
-{
-  BlobChild* actor = ActorFromRemoteBlobImpl(aImpl);
-  if (actor) {
-    return actor->SetMysteryBlobInfo(aName, aContentType,
-                                     aSize, aLastModifiedDate);
-  }
-  return true;
-}
-
-bool
-ResolveMysteryBlob(BlobImpl* aImpl,
-                   const nsString& aContentType,
-                   uint64_t aSize)
-{
-  BlobChild* actor = ActorFromRemoteBlobImpl(aImpl);
-  if (actor) {
-    return actor->SetMysteryBlobInfo(aContentType, aSize);
-  }
-  return true;
-}
-
 bool
 StructuredCloneReadString(JSStructuredCloneReader* aReader,
                           nsCString& aString)
@@ -689,12 +635,8 @@ public:
     MOZ_ASSERT(parent);
 
     if (aData.tag == SCTAG_DOM_BLOB) {
-      if (NS_WARN_IF(!ResolveMysteryBlob(aFile.mBlob->Impl(),
-                                         aData.type,
-                                         aData.size))) {
-        return false;
-      }
-
+      aFile.mBlob->Impl()->SetLazyData(
+        NullString(), aData.type, aData.size, INT64_MAX);
       MOZ_ASSERT(!aFile.mBlob->IsFile());
 
       JS::Rooted<JS::Value> wrappedBlob(aCx);
@@ -706,13 +648,9 @@ public:
       return true;
     }
 
-    if (NS_WARN_IF(!ResolveMysteryFile(aFile.mBlob->Impl(),
-                                       aData.name,
-                                       aData.type,
-                                       aData.size,
-                                       aData.lastModifiedDate))) {
-      return false;
-    }
+    aFile.mBlob->Impl()->SetLazyData(
+      aData.name, aData.type, aData.size,
+      aData.lastModifiedDate * PR_USEC_PER_MSEC);
 
     MOZ_ASSERT(aFile.mBlob->IsFile());
     RefPtr<File> file = aFile.mBlob->ToFile();