Retire http/tests/htmlimports/redirect.html leak exemption.

third_party/WebKit/LayoutTests/LeakExpectations

 # This file is used for tests that only need to be suppressed on the Chromium
 # WebKit Leak bots.
 #
 # This list isn't comprehensive yet, and Leak Detector bots are not tree closers atm.
 # Gardeners are welcome to touch this file, but you can ignore the failures
 # and wait for kouhei@ or hajimehoshi@ to maintain this file.
 
 # view-source:// tests are not supported by the leak detector
 crbug.com/364398 fast/frames/viewsource/viewsource-1.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-2.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-3.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-4.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-5.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-6.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-7.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-incomplete-token.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-unfinished-script.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-unfinished-textarea.html [ Leak ]
 crbug.com/364398 http/tests/security/xssAuditor/viewsource-onmouseover.html [ Leak ]
 crbug.com/364398 http/tests/security/xssAuditor/viewsource-script-tag.html [ Leak ]
 
 # FIXME: The below tests fails when the leak detector is disabled.
 crbug.com/366029 compositing/fixed-body-background-positioned.html [ Failure Pass ]
 
 # FIXME: The below tests crashes when the leak detector is run on debug builds
 crbug.com/366043 [ Debug ] fast/history/history-traversal-is-asynchronous.html [ Crash ]
 
-# FIXME: html imports tests are flaky from extra navigation from leak detector
-crbug.com/366477 http/tests/htmlimports/redirect.html [ Failure Pass ]
-
 # The leak detector doesn't wait for worker threads to completely clean up, so leaks are expected.
 crbug.com/301515 fast/workers/worker-terminate.html [ Leak ]
 
 # FIXME: scroll customization leaks memory. See
 # codereview.chromium.org/1236913004/ for context.
 crbug.com/410974 virtual/scroll_customization/fast/scroll-behavior/scroll-customization/touch-scroll-customization.html [ Leak ]
 crbug.com/410974 virtual/scroll_customization/fast/scroll-behavior/scroll-customization/scrollstate-distribute-to-scroll-chain-descendant.html [ Leak ]
 
 # -----------------------------------------------------------------
 # Untriaged but known real leaks.
@@ skipping 60 matching lines @@
 crbug.com/594603 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-baseline-empty-001a.html [ Leak ]
 crbug.com/594603 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-baseline-empty-001b.html [ Leak ]
 crbug.com/594603 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-baseline-multi-item-vert-001.html [ Leak ]
 crbug.com/594603 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/flexbox/flexbox-whitespace-handling-002.xhtml [ Leak ]
 crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/variables/variable-declaration-15.html [ Leak ]
 crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/variables/variable-declaration-16.html [ Leak ]
 crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/variables/variable-declaration-17.html [ Leak ]
 crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/variables/variable-declaration-18.html [ Leak ]
 crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/variables/variable-external-font-face-01.html [ Pass Leak ]
 crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/variables/variable-font-face-02.html [ Pass Leak ]