Bug 471299: retry code and comments in nsUrlClassifierStore::WriteEntry are wrong, r=dcamp

toolkit/components/url-classifier/src/nsUrlClassifierDBService.cpp

@@ -1937,25 +1937,17 @@ nsUrlClassifierStore::DeleteEntry(nsUrlClassifierEntry& entry)
 nsresult
 nsUrlClassifierStore::WriteEntry(nsUrlClassifierEntry& entry)
 {
-  PRBool newEntry = (entry.mId == -1);
+  if (entry.mId != -1) {
+    // existing entry, just ignore it
+    return NS_OK;
+  }
 
-  if (newEntry) {
-    // The insert statement chooses a random ID for the entry, which
-    // might collide.  This should be exceedingly rare, but we'll try
-    // a few times, otherwise assume a real error.
-    nsresult rv;
-    for (PRUint32 i = 0; i < 10; i++) {
   mozStorageStatementScoper scoper(mInsertStatement);
 
-      rv = BindStatement(entry, mInsertStatement);
+  nsresult rv = BindStatement(entry, mInsertStatement);
   NS_ENSURE_SUCCESS(rv, rv);
 
   rv = mInsertStatement->Execute();
-      if (NS_SUCCEEDED(rv)) {
-        break;
-      }
-    }
-
   NS_ENSURE_SUCCESS(rv, rv);
 
   PRInt64 rowId;
@@ -1967,7 +1959,6 @@ nsUrlClassifierStore::WriteEntry(nsUrlClassifierEntry& entry)
   }
 
   entry.mId = rowId;
-  }
 
   return NS_OK;
 }