Add back a test which I removed, as it is failing again.

Baseline must have changed with last merge.

BUG=17326
TBR=paul

Review URL: http://codereview.chromium.org/155903

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@21257 0039d316-1c4b-4281-b951-d872f2087c98

webkit/tools/layout_tests/test_expectations.txt

@@ -2988,3 +2988,6 @@ BUG17398 LINUX : LayoutTests/fast/borders/borderRadiusDashed03.html = FAIL
 BUG17398 LINUX : LayoutTests/fast/css/pseudo-cache-stale.html = FAIL
 BUG17398 LINUX : LayoutTests/fast/forms/input-appearance-height.html = FAIL
 BUG17398 LINUX : LayoutTests/fast/forms/search-zoomed.html = FAIL
+
+// Test failure from WebKit merge 46141:46143
+BUG17326 LINUX WIN : LayoutTests/editing/execCommand/5138441.html = FAIL