Don't leak the hash table used for the attribute map (#32196). Patch from shaver, r=beard

content/base/src/nsDOMAttributeMap.cpp

@@ -81,6 +81,7 @@ nsDOMAttributeMap::~nsDOMAttributeMap()
 {
   if (nsnull != mAttributes) {
     PL_HashTableEnumerateEntries(mAttributes, RemoveAttributes, nsnull);
+    PL_HashTableDestroy(mAttributes);
   }
 }
 

layout/base/src/nsDOMAttributeMap.cpp

@@ -81,6 +81,7 @@ nsDOMAttributeMap::~nsDOMAttributeMap()
 {
   if (nsnull != mAttributes) {
     PL_HashTableEnumerateEntries(mAttributes, RemoveAttributes, nsnull);
+    PL_HashTableDestroy(mAttributes);
   }
 }