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