On which platform did you installed Chrome? Tested this on both Mac (10.9) and Win (7) with the latest version and the bar is always light grey, the color is not changing.
Regardless of the used platform I think there isn't a way to change this behavior. Maybe this is just a bug that will be solved in the next update. If not you should send an error report: https://support.google.com/chrome/answer/95315?hl=en