diff --git a/xpcom/glue/BlockingResourceBase.cpp b/xpcom/glue/BlockingResourceBase.cpp
index 0a5c81dd9680..15012381d094 100644
--- a/xpcom/glue/BlockingResourceBase.cpp
+++ b/xpcom/glue/BlockingResourceBase.cpp
@@ -39,7 +39,7 @@ BlockingResourceBase::DDT* BlockingResourceBase::sDeadlockDetector;
 
 bool
 BlockingResourceBase::DeadlockDetectorEntry::Print(
-    const DDT::ResourceAcquisition& aFirstSeen,
+    const DeadlockDetectorEntry* aFirstSeen,
     nsACString& aOut) const
 {
   fprintf(stderr, "--- %s : %s",
@@ -193,22 +193,22 @@ BlockingResourceBase::PrintCycle(const DDT::ResourceAcquisitionArray* aCycle,
   fputs("=== Cyclical dependency starts at\n", stderr);
   aOut += "Cyclical dependency starts at\n";
 
-  const DDT::ResourceAcquisition res = aCycle->ElementAt(0);
-  maybeImminent &= res.mResource->Print(res, aOut);
+  const DeadlockDetectorEntry* res = aCycle->ElementAt(0);
+  maybeImminent &= res->Print(res, aOut);
 
   DDT::ResourceAcquisitionArray::index_type i;
   DDT::ResourceAcquisitionArray::size_type len = aCycle->Length();
-  const DDT::ResourceAcquisition* it = 1 + aCycle->Elements();
+  const DDT::ResourceAcquisitionArray::elem_type* it = 1 + aCycle->Elements();
   for (i = 1; i < len - 1; ++i, ++it) {
     fputs("\n--- Next dependency:\n", stderr);
     aOut += "\nNext dependency:\n";
 
-    maybeImminent &= it->mResource->Print(*it, aOut);
+    maybeImminent &= (*it)->Print(*it, aOut);
   }
 
   fputs("\n=== Cycle completed at\n", stderr);
   aOut += "Cycle completed at\n";
-  it->mResource->Print(*it, aOut);
+  (*it)->Print(*it, aOut);
 
   return maybeImminent;
 }
diff --git a/xpcom/glue/BlockingResourceBase.h b/xpcom/glue/BlockingResourceBase.h
index 4217f5f984bf..e5c08e0acaa5 100644
--- a/xpcom/glue/BlockingResourceBase.h
+++ b/xpcom/glue/BlockingResourceBase.h
@@ -113,7 +113,7 @@ private:
      * contexts into strings, all info is written to stderr, but
      * only some info is written into |aOut|
      */
-    bool Print(const DDT::ResourceAcquisition& aFirstSeen,
+    bool Print(const DeadlockDetectorEntry* aFirstSeen,
                nsACString& aOut) const;
 
     /**
diff --git a/xpcom/glue/DeadlockDetector.h b/xpcom/glue/DeadlockDetector.h
index 355f535eff4d..1bbd8e6d91ab 100644
--- a/xpcom/glue/DeadlockDetector.h
+++ b/xpcom/glue/DeadlockDetector.h
@@ -65,32 +65,7 @@ template<typename T>
 class DeadlockDetector
 {
 public:
-  /**
-   * ResourceAcquisition
-   * Consists simply of a resource and the calling context from
-   * which it was acquired.  We pack this information together so
-   * that it can be returned back to the caller when a potential
-   * deadlock has been found.
-   */
-  struct ResourceAcquisition
-  {
-    const T* mResource;
-
-    explicit ResourceAcquisition(const T* aResource)
-      : mResource(aResource)
-    {
-    }
-    ResourceAcquisition(const ResourceAcquisition& aFrom)
-      : mResource(aFrom.mResource)
-    {
-    }
-    ResourceAcquisition& operator=(const ResourceAcquisition& aFrom)
-    {
-      mResource = aFrom.mResource;
-      return *this;
-    }
-  };
-  typedef nsTArray<ResourceAcquisition> ResourceAcquisitionArray;
+  typedef nsTArray<const T*> ResourceAcquisitionArray;
 
 private:
   struct OrderingEntry;
@@ -278,8 +253,8 @@ public:
       if (!cycle) {
         NS_RUNTIMEABORT("can't allocate dep. cycle array");
       }
-      cycle->AppendElement(ResourceAcquisition(current->mResource));
-      cycle->AppendElement(ResourceAcquisition(aProposed));
+      cycle->AppendElement(current->mResource);
+      cycle->AppendElement(aProposed);
       return cycle;
     }
     if (InTransitiveClosure(current, proposed)) {
@@ -294,7 +269,7 @@ public:
       // right conditions.
       ResourceAcquisitionArray* cycle = GetDeductionChain(proposed, current);
       // show how acquiring |aProposed| would complete the cycle
-      cycle->AppendElement(ResourceAcquisition(aProposed));
+      cycle->AppendElement(aProposed);
       return cycle;
     }
     // |aLast|, |aProposed| are unordered according to our
@@ -354,7 +329,7 @@ public:
     if (!chain) {
       NS_RUNTIMEABORT("can't allocate dep. cycle array");
     }
-    chain->AppendElement(ResourceAcquisition(aStart->mResource));
+    chain->AppendElement(aStart->mResource);
 
     NS_ASSERTION(GetDeductionChain_Helper(aStart, aTarget, chain),
                  "GetDeductionChain called when there's no deadlock");
@@ -368,14 +343,14 @@ public:
                                 ResourceAcquisitionArray* aChain)
   {
     if (aStart->mOrderedLT.BinaryIndexOf(aTarget) != NoIndex) {
-      aChain->AppendElement(ResourceAcquisition(aTarget->mResource));
+      aChain->AppendElement(aTarget->mResource);
       return true;
     }
 
     index_type i = 0;
     size_type len = aStart->mOrderedLT.Length();
     for (const OrderingEntry* const* it = aStart->mOrderedLT.Elements(); i < len; ++i, ++it) {
-      aChain->AppendElement(ResourceAcquisition((*it)->mResource));
+      aChain->AppendElement((*it)->mResource);
       if (GetDeductionChain_Helper(*it, aTarget, aChain)) {
         return true;
       }