Add domxpath/xml_xpath_tests.xml to list of files to skip when updating WPT.

This file is too large to upload to Rietveld. This is just a quick fix CL for this particular case of a large file.

NOEXPORT=true
BUG=676491

Review-Url: https://codereview.chromium.org/2619163005
Cr-Commit-Position: refs/heads/master@{#442841}

third_party/WebKit/LayoutTests/W3CImportExpectations

@@ -725,9 +725,10 @@ crbug.com/656171 imported/wpt/workers/semantics/encodings [ Skip ]
 imported/wpt/domxpath/001.html [ Skip ]
 imported/wpt/domxpath/002.html [ Skip ]
 
-# This test depends on a file (domxpath/xml_xpath_tests.xml) which is too large
+# This test depends on a file xml_xpath_tests.xml, which is too large
 # for Rietveld to handle now, so it's not currently imported.
 crbug.com/676491 imported/wpt/domxpath/xml_xpath_runner.html [ Skip ]
+crbug.com/676491 imported/wpt/domxpath/xml_xpath_tests.xml [ Skip ]
 
 # Manual tests that fail as TIMEOUT or NOTRUN. Consider adding wpt_automation.
 imported/wpt/FileAPI/BlobURL/test1-manual.html [ Skip ]