Fix tag closing issues in the WebVTT tree builder

LayoutTests/media/track/opera/track/webvtt/parsing-cue-data/tests/tree-building-expected.txt

Index: LayoutTests/media/track/opera/track/webvtt/parsing-cue-data/tests/tree-building-expected.txt
diff --git a/LayoutTests/media/track/opera/track/webvtt/parsing-cue-data/tests/tree-building-expected.txt b/LayoutTests/media/track/opera/track/webvtt/parsing-cue-data/tests/tree-building-expected.txt
index 939224b2ee0a226b0cf026ef09f3c149afc98d86..b212b33da41ebe733ff2273f65f1586da7c624fa 100644
--- a/LayoutTests/media/track/opera/track/webvtt/parsing-cue-data/tests/tree-building-expected.txt
+++ b/LayoutTests/media/track/opera/track/webvtt/parsing-cue-data/tests/tree-building-expected.txt
@@ -11,10 +11,10 @@ FAIL WebVTT cue data parser test tree-building - 68e1d0376f827ebe0c047751a206759
 PASS WebVTT cue data parser test tree-building - 2564487cfc7e317428fb437ef8de8de4f4963426 
 PASS WebVTT cue data parser test tree-building - 9b1902c975558eeaff4afbaf0a6dc100e1978769 
 PASS WebVTT cue data parser test tree-building - 119c596ea09649d3bd03934485e3067e89377412 
-FAIL WebVTT cue data parser test tree-building - c94512b045699cb72f730e46b2a0a3bed2c939f9 assert_equals: expected "#document-fragment\n| <ruby>\n|   \"test\"\n|   <rt>\n|     \"test\"\n| \"test\"" but got "#document-fragment\n| <ruby>\n|   \"test\"\n|   <rt>\n|     \"test\"\n|   \"test\""
-FAIL WebVTT cue data parser test tree-building - 325c1e590e74f1ff33ca5b4838c04cf6b6dd71ba assert_equals: expected "#document-fragment\n| <ruby>\n|   \"test\"\n|   <rt>\n|     <b>\n|       \"test\"\n|       \"test\"" but got "#document-fragment\n| <ruby>\n|   \"test\"\n|   <rt>\n|     <b>\n|       \"test\"\n|   \"test\""
-FAIL WebVTT cue data parser test tree-building - 92847ed2694c9639ba96f4cc61e2215362a74904 assert_equals: expected "#document-fragment\n| <ruby>\n|   \"test\"\n|   <rt>\n|     <b>\n|       \"test\"\n|       \"test\"" but got "#document-fragment\n| <ruby>\n|   \"test\"\n|   <rt>\n|     <b>\n|       \"test\"\n|     \"test\""
-FAIL WebVTT cue data parser test tree-building - c0da62d1c8716ca544c96799f06ac7e4664500fb assert_equals: expected "#document-fragment\n| <ruby>\n|   \"test\"\n|   <rt>\n|     <b>\n|       \"test\"\n|     \"test\"" but got "#document-fragment\n| <ruby>\n|   \"test\"\n|   <rt>\n|     <b>\n|       \"test\"\n| \"test\""
+PASS WebVTT cue data parser test tree-building - c94512b045699cb72f730e46b2a0a3bed2c939f9 
+PASS WebVTT cue data parser test tree-building - 325c1e590e74f1ff33ca5b4838c04cf6b6dd71ba 
+PASS WebVTT cue data parser test tree-building - 92847ed2694c9639ba96f4cc61e2215362a74904 
+PASS WebVTT cue data parser test tree-building - c0da62d1c8716ca544c96799f06ac7e4664500fb 
 PASS WebVTT cue data parser test tree-building - b85bd616672eba0591718182ef32e3307d223bb0 
 PASS WebVTT cue data parser test tree-building - ab2024b4e65ed64a751adbe8aae1e84ee61bf3e6 
 PASS WebVTT cue data parser test tree-building - 10f4823ffb17c71654c4602bc45c58300e3ecbcc