How i do it?
1. Use Color Replacement tool(set mode on "Color") to pick up the average color tone of hair, and paint it over the bluish tint on the hair.
2. After replacing the color, the hair might look good enough already. But if you prefer to reduce the highlights a little bit, you can use Burn tool.
Alternatively, what i did was selecting the highlights by using color range, feather the selection(i used 2px), then duplicate to new layer(CTRL + J). Set blending mode for this layer to multiply with opacity about 25%.
the hair might looks kinda dry still, but that's what photography comes into importance.. =)