[Sheriff] Mark http/tests/navigation/navigation-interrupted-by-fragment.html as timeout-flaky

This test appears to be timeout-flaky on both Linux (dbg) and Mac (dbg).

TBR=clamy@chromium.org

Bug: 846747
Change-Id: Ic2fb023374915a8c5516127e5172402d8a4af27d
Reviewed-on: https://chromium-review.googlesource.com/1151788Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578407}

third_party/WebKit/LayoutTests/TestExpectations

@@ -164,7 +164,8 @@ crbug.com/857490 virtual/paint-touchaction-rects/fast/events/touch/gesture/pad-g
 crbug.com/857490 virtual/paint-touchaction-rects/fast/events/touch/gesture/touch-gesture-fling-with-page-scale.html [ Skip ]
 
 # Sheriff 2018/05/25
-crbug.com/846749 [ Mac ] virtual/stable/http/tests/navigation/navigation-interrupted-by-fragment.html  [ Pass Failure ]
+crbug.com/846749 [ Linux Mac Debug ] http/tests/navigation/navigation-interrupted-by-fragment.html  [ Pass Timeout ]
+crbug.com/846749 [ Linux Mac Debug ] virtual/stable/http/tests/navigation/navigation-interrupted-by-fragment.html  [ Pass Timeout ]
 
 crbug.com/849459 fragmentation/repeating-thead-under-repeating-thead.html [ Failure ]
 
@@ -4796,4 +4797,4 @@ crbug.com/867376 [ Mac ] http/tests/devtools/elements/elements-inspect-iframe-fr
 crbug.com/867376 [ Mac ] http/tests/devtools/elements/css-variables/resolve-inherited-css-variables.js [ Timeout Pass ]
 crbug.com/867376 [ Linux ] virtual/gpu/fast/canvas/canvas-blending-image-over-color.html [ Timeout Pass ]
 crbug.com/867376 [ Linux ] virtual/gpu/fast/canvas/canvas-blending-image-over-image.html [ Timeout Pass ]
-crbug.com/867376 [ Linux ] virtual/gpu-rasterization/images/color-profile-mask-image-svg.html [ Timeout Pass ]
\ No newline at end of file
+crbug.com/867376 [ Linux ] virtual/gpu-rasterization/images/color-profile-mask-image-svg.html [ Timeout Pass ]