Revert r403630 which broke parsing on some sites.

third_party/WebKit/Source/core/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/bindings/modules/v8/generated.gni")
@@ skipping 1118 matching lines @@
     "html/parser/CSSPreloadScannerTest.cpp",
     "html/parser/CompactHTMLTokenTest.cpp",
     "html/parser/HTMLDocumentParserTest.cpp",
     "html/parser/HTMLEntityParserTest.cpp",
     "html/parser/HTMLParserIdiomsTest.cpp",
     "html/parser/HTMLParserThreadTest.cpp",
     "html/parser/HTMLPreloadScannerTest.cpp",
     "html/parser/HTMLResourcePreloaderTest.cpp",
     "html/parser/HTMLSrcsetParserTest.cpp",
     "html/parser/HTMLTokenizerTest.cpp",
-    "html/parser/HTMLTreeBuilderSimulatorTest.cpp",
     "html/parser/TextResourceDecoderTest.cpp",
     "html/shadow/MediaControlsTest.cpp",
     "html/track/TextTrackListTest.cpp",
     "html/track/vtt/BufferedLineReaderTest.cpp",
     "html/track/vtt/VTTScannerTest.cpp",
     "input/EventHandlerTest.cpp",
     "inspector/InspectorWebPerfAgentTest.cpp",
     "inspector/ProtocolParserTest.cpp",
     "layout/ImageQualityControllerTest.cpp",
     "layout/InlineTextBoxTest.cpp",
@@ skipping 109 matching lines @@
   sources = [
     "html/parser/HTMLPreloadScannerFuzzer.cpp",
     "html/parser/TextResourceDecoderForFuzzing.h",
   ]
   seed_corpus = "//third_party/WebKit/LayoutTests/fast/parser"
   deps = [
     ":core",
     "../platform:blink_fuzzer_test_support",
   ]
 }