Re-enable imported/wpt/html/syntax/parsing/html5lib_tests19.html.

imported/wpt/html/syntax/parsing/html5lib_tests19.html used to be
disabled in presence of site-per-process / Site Isolation, because it
might trigger a crash.  It seems that the crash is not happening
anymore, so let's try removing the Crash/Failure expectations for the
test from TestExpectations.  This also means that running the test
via not-site-per-process virtual test suite is not needed anymore.

Note that this CL does not modify html5lib_tests19-expected.txt - some
test cases inside tests19 are expected to fail.  This expectation came
from the very beginning - when WPT were being imported in
https://codereview.chromium.org/1164243002

Bug: 645641
Change-Id: Ib0584faac35f09703821c441fdca10726ceb0d48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863539
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Auto-Submit: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706195}

third_party/blink/web_tests/TestExpectations

@@ -60,7 +60,6 @@ crbug.com/887140 hdr/video-canvas-alpha.html [ Failure ]
 # Tests temporarily disabled with Site Isolation - test issues or test harness
 # issues (e.g. missing OOPIF support in the test harness).
 # TODO(lukasza, alexmos): Burn down this list.
-crbug.com/645641 external/wpt/html/syntax/parsing/html5lib_tests19.html [ Crash Failure ]
 crbug.com/665058 http/tests/local/drag-over-remote-content.html [ Crash Timeout ]
 crbug.com/771003 http/tests/security/mixedContent/insecure-iframe-in-main-frame.html [ Failure ]
 

third_party/blink/web_tests/VirtualTestSuites

@@ -826,11 +826,6 @@
     "base": "external/wpt/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/window-similar-but-cross-origin-success.sub.html",
     "args": ["--disable-site-isolation-trials"]
   },
-  {
-    "prefix": "not-site-per-process",
-    "base": "external/wpt/html/syntax/parsing/html5lib_tests19.html",
-    "args": ["--disable-site-isolation-trials"]
-  },
   {
     "prefix": "not-site-per-process",
     "base": "external/wpt/html/user-activation/message-event-activation-api-iframe-cross-origin.sub.tentative.html",