Remove a "Timeout" label for a layout test

The chromium flakiness dashboard shows this test is not timing out:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=canvas-partial-invalidation-zoomed.html

TBR=junov@chromium.org
BUG=440452

Review-Url: https://codereview.chromium.org/2164763004
Cr-Commit-Position: refs/heads/master@{#406688}

third_party/WebKit/LayoutTests/TestExpectations

@@ -837,8 +837,6 @@ crbug.com/624233 [ Win ] virtual/gpu-rasterization/fast/images/color-profile-bac
 
 crbug.com/385014 crbug.com/410145 accessibility/canvas-fallback-content-2.html [ Pass Failure Timeout ]
 
-crbug.com/440452 virtual/display_list_2d_canvas/fast/canvas/canvas-partial-invalidation-zoomed.html [ Pass Timeout ]
-
 crbug.com/574283 [ Mac ] virtual/threaded/fast/scroll-behavior/smooth-scroll/fixed-background-in-iframe.html [ Skip ]
 crbug.com/574283 [ Mac ] virtual/threaded/fast/scroll-behavior/smooth-scroll/horizontal-smooth-scroll-in-rtl.html [ Skip ]
 crbug.com/574283 [ Mac ] virtual/threaded/fast/scroll-behavior/smooth-scroll/main-thread-scrolling-reason-added.html [ Skip ]