Assign correct bug number for WPT shadow-dom tests

Correct old bug numbers, which were assigned to fix flaky crashes
of WPT shadow-dom tests.  The crashes are gone now, and reassign
to regular WPT shadow-dom issue (505364).

NOTRY=true
TBR=tkent@chromium.org
BUG=505364

Review URL: https://codereview.chromium.org/1326123003

git-svn-id: svn://svn.chromium.org/blink/trunk@201776 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -429,10 +429,10 @@ crbug.com/505364 imported/web-platform-tests/shadow-dom/styles/test-003.html [ F
 crbug.com/505364 imported/web-platform-tests/shadow-dom/styles/test-010.html [ Failure Crash ]
 crbug.com/505364 imported/web-platform-tests/shadow-dom/user-interaction/ranges-and-selections/test-002.html [ Failure Crash ]
 
-crbug.com/521941 imported/web-platform-tests/shadow-dom/shadow-trees/lower-boundary-encapsulation/test-004.html [ Failure ]
-crbug.com/521918 imported/web-platform-tests/shadow-dom/shadow-trees/upper-boundary-encapsulation/dom-tree-accessors-001.html [ Failure ]
-crbug.com/521918 imported/web-platform-tests/shadow-dom/shadow-trees/upper-boundary-encapsulation/dom-tree-accessors-002.html [ Failure ]
-crbug.com/521907 imported/web-platform-tests/shadow-dom/shadow-trees/upper-boundary-encapsulation/ownerdocument-002.html [ Failure ]
+crbug.com/505364 imported/web-platform-tests/shadow-dom/shadow-trees/lower-boundary-encapsulation/test-004.html [ Failure ]
+crbug.com/505364 imported/web-platform-tests/shadow-dom/shadow-trees/upper-boundary-encapsulation/dom-tree-accessors-001.html [ Failure ]
+crbug.com/505364 imported/web-platform-tests/shadow-dom/shadow-trees/upper-boundary-encapsulation/dom-tree-accessors-002.html [ Failure ]
+crbug.com/505364 imported/web-platform-tests/shadow-dom/shadow-trees/upper-boundary-encapsulation/ownerdocument-002.html [ Failure ]
 crbug.com/505364 crbug.com/520616 imported/web-platform-tests/shadow-dom/shadow-trees/upper-boundary-encapsulation/test-009.html [ Failure ]
 
 crbug.com/387740 imported/web-platform-tests/mediacapture-streams/stream-api/introduction/disabled-audio-silence.html [ Skip ]