Revert of Revert r403630 which broke parsing on some sites.

Revert of Revert r403630 which broke parsing on some sites. (patchset #1 id:1 of https://codereview.chromium.org/2380513002/ )

Reason for revert:
BUILD.gn change missing from this merge, causing breakage on the Beta builders https://uberchromegw.corp.google.com/i/official.desktop.continuous/builders/precise64%20beta/builds/4150

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

Original issue's description:
> 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

TBR=dominicc@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=542803, 639541

[jwd, 2016-09-28 19:37:49]

The CQ bit was checked by jwd@chromium.org

[jwd, 2016-09-28 19:37:49]

Created Revert of Revert r403630 which broke parsing on some sites.

[commit-bot: I haz the power, 2016-09-28 19:38:22]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-28 19:41:25]

Description was changed from

==========
Revert of Revert r403630 which broke parsing on some sites. (patchset #1 id:1 of
https://codereview.chromium.org/2380513002/ )

Reason for revert:
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

Original issue's description:
> 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...

TBR=dominicc@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=542803,639541
==========

to

==========
Revert of Revert r403630 which broke parsing on some sites. (patchset #1 id:1 of
https://codereview.chromium.org/2380513002/ )

Reason for revert:
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

Original issue's description:
> 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...

TBR=dominicc@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=542803,639541
==========

[commit-bot: I haz the power, 2016-09-28 19:41:26]

Committed patchset #1 (id:1)