minor UI nit: extra pixel line?

[sigmundch]

I just noticed a minor thing in the UI on my chromebook. THis only shows up when the window is maximized vertically.

I can see a line, practically just a 1px width, between the top-banner and the sub-banner. Here is a screenshot:

Then, when scrolling down and you make the subbanner disappear, the pixel line is visible on the top, above the top-banner. See for example that in this screenshot some of the letters are visible behind the banner (between the grey bookmarks bar and the Dart SDK banner:

Version information: Google Chrome 46.0.2490.82 (Official Build) (64-bit)