Bug 571581 - Propagate SQLITE_CONSTRAINT as an nsresult

r=asuth
sr=vlad

storage/public/mozStorage.h

@@ -45,4 +45,7 @@
 #define NS_ERROR_STORAGE_IOERR \
   NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_STORAGE, 2)
 
+#define NS_ERROR_STORAGE_CONSTRAINT \
+  NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_STORAGE, 3)
+
 #endif /* MOZSTORAGE_H */

storage/src/mozStoragePrivateHelpers.cpp

@@ -89,6 +89,8 @@ convertResultCode(int aSQLiteResultCode)
     case SQLITE_ABORT:
     case SQLITE_INTERRUPT:
       return NS_ERROR_ABORT;
+    case SQLITE_CONSTRAINT:
+      return NS_ERROR_STORAGE_CONSTRAINT;
   }
 
   // generic error