http/tests/images/bmp-partial-load.html is not flaky

Remove the flake XP test expectation for this test.

TBR=scroggo@chromium.org
NOTRY=true
BUG=485527

Review URL: https://codereview.chromium.org/1210373003

git-svn-id: svn://svn.chromium.org/blink/trunk@197929 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -813,8 +813,6 @@ crbug.com/313217 fast/dom/node-iterator-document-moved-crash.html [ Crash Pass ]
 crbug.com/313219 traversal/tree-walker-005.html [ Crash Pass ]
 crbug.com/313219 traversal/node-iterator-004.html [ Crash Pass ]
 
-crbug.com/313846 [ Release XP ] http/tests/images/bmp-partial-load.html [ ImageOnlyFailure Pass ]
-
 crbug.com/326139 media/video-frame-accurate-seek.html [ Pass ImageOnlyFailure ]
 
 crbug.com/245556 compositing/transitions/transform-on-large-layer.html [ ImageOnlyFailure ]