Remove tests which no longer fail from TestExpectations

They no longer fail.

BUG=392771,869308

Change-Id: I8c9dd48eb481ade4626327f737c8e577da577665
Reviewed-on: https://chromium-review.googlesource.com/1233105Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592373}

third_party/WebKit/LayoutTests/TestExpectations

@@ -2033,10 +2033,6 @@ crbug.com/766135 virtual/user-activation-v2/fast/dom/Window/redirect-with-timer.
 crbug.com/404597 [ Mac ] fast/css3-text/css3-text-justify/text-justify-crash.html [ Failure ]
 crbug.com/404597 fast/forms/long-text-in-input.html [ Skip ]
 
-# Web Components related tests (Shadow DOM, Custom Elements) failures.
-crbug.com/392771 external/wpt/shadow-dom/untriaged/styles/test-003.html [ Failure ]
-crbug.com/869308 shadow-dom/imperative-api.html [ Failure ]
-
 crbug.com/552494 virtual/prefer_compositing_to_lcd_text/scrollbars/overflow-scrollbar-combinations.html [ Pass Failure ]
 
 crbug.com/652964 [ Linux Win ] fast/text/hyphens/hyphen-min-preferred-width-mock.html [ Skip ]