Revert r403630 which broke parsing on some sites.

Revert r403630 which broke parsing on some sites.

HTMLTreeBuilderSimulator needs to line up with HTML parsing. r403630
tried to bring them closer together, but this regressed some existing
sites. This should be relanded but it needs to make the parser and
simulator more reliably consistent.

BUG=542803, 639541
Review-Url: https://codereview.chromium.org/2366203006
Cr-Commit-Position: refs/heads/master@{#421177}
(cherry picked from commit 6a454415188221d203662987d887c4ab70a2a877)

Committed: https://chromium.googlesource.com/chromium/src/+/5b2166eee42a2936e0653929afb2595d614288fb

[dominicc (has gone to gerrit), 2016-09-28 02:29:56]

Description was changed from

==========
Revert r403630 which broke parsing on some sites.

HTMLTreeBuilderSimulator needs to line up with HTML parsing. r403630
tried to bring them closer together, but this regressed some existing
sites. This should be relanded but it needs to make the parser and
simulator more reliably consistent.

BUG=542803,639541

Review-Url: https://codereview.chromium.org/2366203006
Cr-Commit-Position: refs/heads/master@{#421177}
(cherry picked from commit 6a454415188221d203662987d887c4ab70a2a877)
==========

to

==========
Revert r403630 which broke parsing on some sites.

HTMLTreeBuilderSimulator needs to line up with HTML parsing. r403630
tried to bring them closer together, but this regressed some existing
sites. This should be relanded but it needs to make the parser and
simulator more reliably consistent.

BUG=542803,639541

Review-Url: https://codereview.chromium.org/2366203006
Cr-Commit-Position: refs/heads/master@{#421177}
(cherry picked from commit 6a454415188221d203662987d887c4ab70a2a877)

Committed:
https://chromium.googlesource.com/chromium/src/+/5b2166eee42a2936e0653929afb2...
==========

[dominicc (has gone to gerrit), 2016-09-28 02:29:58]

Committed patchset #1 (id:1) manually as
5b2166eee42a2936e0653929afb2595d614288fb.

[jwd, 2016-09-28 19:37:48]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2382523002/ by jwd@chromium.org.

The reason for reverting is: BUILD.gn change missing from this merge, causing
breakage on the Beta builders
https://uberchromegw.corp.google.com/i/official.desktop.continuous/builders/p...

ERROR at //testing/test.gni:271:5: Source file not found.
    executable(target_name) {
    ^------------------------
The target:
  //third_party/WebKit/Source/web:webkit_unit_tests
has a source file:
  //third_party/WebKit/Source/core/html/parser/HTMLTreeBuilderSimulatorTest.cpp.