The size of the text != the size of the rows in the data grids on Windows.
On the datagrids I tested, this is true for: Profiling, Local Storage, Session Storage, Cookies.
Created attachment 42116 [details]
Created attachment 42131 [details]
Created attachment 42133 [details]
Fix with better formatting
This patch seems fine. But I think the font looks funny (too small) and the line height is too tall. I bet this can be fixed by making the line-height be a fixed height.
Try adding line-height: 12px or 10px (or something) to ".data-grid td".
Created attachment 42143 [details]
Screenshot w/ line-height: 12px (FIXED)
Created attachment 42144 [details]
Landed in r50300.