Fix win-specific baselines for printing layout test

The previous platform/win expected.png file was not a printing
layout.

Bug: 618082
Change-Id: I73c5d69a4f5d45086d974178f2d21151f5bb10d5
Reviewed-on: https://chromium-review.googlesource.com/781980Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518386}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1803,9 +1803,6 @@ crbug.com/591500 [ Win10 ] printing/fixed-positioned-headers-and-footers-clipped
 crbug.com/591500 [ Win10 ] virtual/threaded/printing/ellipsis-printing-style.html [ Skip ]
 crbug.com/591500 [ Win10 ] printing/ellipsis-printing-style.html [ Skip ]
 
-crbug.com/618082 [ Win10 ] printing/thead-repeats-at-top-of-each-page.html [ Failure ]
-crbug.com/618082 [ Win10 ] virtual/threaded/printing/thead-repeats-at-top-of-each-page.html [ Failure ]
-
 crbug.com/474759 fast/writing-mode/vertical-rl-replaced-selection.html [ Failure ]
 
 crbug.com/353746 virtual/android/fullscreen/video-specified-size.html [ Failure Pass ]