1query_parser is a components used by both history and bookmarks to avoid having 2a cyclic dependencies between the two components. It only exports types used to 3parse and normalize queries into the history search. 4 5query_parser is not allowed to depend on content/, because it is used by iOS. 6If dependences on content/ need to be added to query_parser, it will have to be 7made into a layered component. See [1] for more information. 8 91: http://www.chromium.org/developers/design-documents/layered-components-design 10