Revert of Add ScopedTaskEnvironment::ExecutionControlMode.

Revert of Add ScopedTaskEnvironment::ExecutionControlMode. (patchset #6 id:100001 of https://codereview.chromium.org/2891363005/ )

Reason for revert:
Is causing consistent test failures on the main waterfall in net_unittests URLRequestSimpleJobTest.CancelAfterFirstReadStarted, for example:

https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.mac%2FMac10.9_Tests%2F41620%2F%2B%2Frecipes%2Fsteps%2Fnet_unittests%2F0%2Flogs%2FURLRequestSimpleJobTest.CancelAfterFirstReadStarted%2F0


[1130:771:0523/094643.091773:30621298248173:FATAL:scoped_task_environment.cc(178)] Check failed: !task_queue_empty_closure_.
0   net_unittests                       0x0000000102d4603c base::debug::StackTrace::StackTrace(unsigned long) + 28
1   net_unittests                       0x0000000102d5db70 logging::LogMessage::~LogMessage() + 224
2   net_unittests                       0x000000010302df97 base::test::ScopedTaskEnvironment::RunUntilIdle() + 183
3   net_unittests                       0x000000010205f824 net::URLRequestSimpleJobTest_CancelAfterFirstReadStarted_Test::TestBody() + 260
4   net_unittests                       0x00000001022adf56 testing::Test::Run() + 246
5   net_unittests                       0x00000001022ae9f0 testing::TestInfo::Run() + 288
6   net_unittests                       0x00000001022aef57 testing::TestCase::Run() + 263
7   net_unittests                       0x00000001022b5057 testing::internal::UnitTestImpl::RunAllTests() + 871
8   net_unittests                       0x00000001022b4cc3 testing::UnitTest::Run() + 163
9   net_unittests                       0x00000001030309b3 base::TestSuite::Run() + 163
10  net_unittests                       0x000000010303e176 base::LaunchUnitTests(int, char**, base::Callback<int (), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&) + 134
11  net_unittests                       0x0000000101fdf008 main + 440
12  libdyld.dylib                       0x00007fff8d4495fd start + 1
13  ???                                 0x0000000000000007 0x0 + 7


Original issue's description:
> Add ScopedTaskEnvironment::ExecutionControlMode.
> 
> This enum controls whether tasks posted within the scope of a
> ScopedTaskEnvironment can run as they are posted or have to wait
> until a call to RunUntilIdle() to run.
> 
> BUG=724077
> TBR=gab@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2891363005
> Cr-Commit-Position: refs/heads/master@{#473925}
> Committed: https://chromium.googlesource.com/chromium/src/+/fc7b5ec521b29a97e63a7cda5921aa5ed793679a

TBR=gab@chromium.org,robliao@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=724077
Review-Url: https://codereview.chromium.org/2903633003
Cr-Commit-Position: refs/heads/master@{#473950}
Committed: https://chromium.googlesource.com/chromium/src/+/92ac1582b78a62c5c3d1b49c0b1ef6088a065054

[Marijn Kruisselbrink, 2017-05-23 17:07:15]

The CQ bit was checked by mek@chromium.org

[Marijn Kruisselbrink, 2017-05-23 17:07:16]

Created Revert of Add ScopedTaskEnvironment::ExecutionControlMode.

[commit-bot: I haz the power, 2017-05-23 17:07:46]

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, 2017-05-23 17:08:16]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1495559235804670, "parent_rev":
"c958dad1cb42b5e9ad6660b4fd35761b51444d5b", "commit_rev":
"92ac1582b78a62c5c3d1b49c0b1ef6088a065054"}

[commit-bot: I haz the power, 2017-05-23 17:08:27]

Description was changed from

==========
Revert of Add ScopedTaskEnvironment::ExecutionControlMode. (patchset #6
id:100001 of https://codereview.chromium.org/2891363005/ )

Reason for revert:
Is causing consistent test failures on the main waterfall in net_unittests
URLRequestSimpleJobTest.CancelAfterFirstReadStarted, for example:

https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.mac%2FMac10.9_T...


[1130:771:0523/094643.091773:30621298248173:FATAL:scoped_task_environment.cc(178)]
Check failed: !task_queue_empty_closure_.
0   net_unittests                       0x0000000102d4603c
base::debug::StackTrace::StackTrace(unsigned long) + 28
1   net_unittests                       0x0000000102d5db70
logging::LogMessage::~LogMessage() + 224
2   net_unittests                       0x000000010302df97
base::test::ScopedTaskEnvironment::RunUntilIdle() + 183
3   net_unittests                       0x000000010205f824
net::URLRequestSimpleJobTest_CancelAfterFirstReadStarted_Test::TestBody() + 260
4   net_unittests                       0x00000001022adf56 testing::Test::Run()
+ 246
5   net_unittests                       0x00000001022ae9f0
testing::TestInfo::Run() + 288
6   net_unittests                       0x00000001022aef57
testing::TestCase::Run() + 263
7   net_unittests                       0x00000001022b5057
testing::internal::UnitTestImpl::RunAllTests() + 871
8   net_unittests                       0x00000001022b4cc3
testing::UnitTest::Run() + 163
9   net_unittests                       0x00000001030309b3
base::TestSuite::Run() + 163
10  net_unittests                       0x000000010303e176
base::LaunchUnitTests(int, char**, base::Callback<int (),
(base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&) + 134
11  net_unittests                       0x0000000101fdf008 main + 440
12  libdyld.dylib                       0x00007fff8d4495fd start + 1
13  ???                                 0x0000000000000007 0x0 + 7


Original issue's description:
> Add ScopedTaskEnvironment::ExecutionControlMode.
> 
> This enum controls whether tasks posted within the scope of a
> ScopedTaskEnvironment can run as they are posted or have to wait
> until a call to RunUntilIdle() to run.
> 
> BUG=724077
> TBR=gab@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2891363005
> Cr-Commit-Position: refs/heads/master@{#473925}
> Committed:
https://chromium.googlesource.com/chromium/src/+/fc7b5ec521b29a97e63a7cda5921...

TBR=gab@chromium.org,robliao@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=724077
==========

to

==========
Revert of Add ScopedTaskEnvironment::ExecutionControlMode. (patchset #6
id:100001 of https://codereview.chromium.org/2891363005/ )

Reason for revert:
Is causing consistent test failures on the main waterfall in net_unittests
URLRequestSimpleJobTest.CancelAfterFirstReadStarted, for example:

https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.mac%2FMac10.9_T...


[1130:771:0523/094643.091773:30621298248173:FATAL:scoped_task_environment.cc(178)]
Check failed: !task_queue_empty_closure_.
0   net_unittests                       0x0000000102d4603c
base::debug::StackTrace::StackTrace(unsigned long) + 28
1   net_unittests                       0x0000000102d5db70
logging::LogMessage::~LogMessage() + 224
2   net_unittests                       0x000000010302df97
base::test::ScopedTaskEnvironment::RunUntilIdle() + 183
3   net_unittests                       0x000000010205f824
net::URLRequestSimpleJobTest_CancelAfterFirstReadStarted_Test::TestBody() + 260
4   net_unittests                       0x00000001022adf56 testing::Test::Run()
+ 246
5   net_unittests                       0x00000001022ae9f0
testing::TestInfo::Run() + 288
6   net_unittests                       0x00000001022aef57
testing::TestCase::Run() + 263
7   net_unittests                       0x00000001022b5057
testing::internal::UnitTestImpl::RunAllTests() + 871
8   net_unittests                       0x00000001022b4cc3
testing::UnitTest::Run() + 163
9   net_unittests                       0x00000001030309b3
base::TestSuite::Run() + 163
10  net_unittests                       0x000000010303e176
base::LaunchUnitTests(int, char**, base::Callback<int (),
(base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&) + 134
11  net_unittests                       0x0000000101fdf008 main + 440
12  libdyld.dylib                       0x00007fff8d4495fd start + 1
13  ???                                 0x0000000000000007 0x0 + 7


Original issue's description:
> Add ScopedTaskEnvironment::ExecutionControlMode.
> 
> This enum controls whether tasks posted within the scope of a
> ScopedTaskEnvironment can run as they are posted or have to wait
> until a call to RunUntilIdle() to run.
> 
> BUG=724077
> TBR=gab@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2891363005
> Cr-Commit-Position: refs/heads/master@{#473925}
> Committed:
https://chromium.googlesource.com/chromium/src/+/fc7b5ec521b29a97e63a7cda5921...

TBR=gab@chromium.org,robliao@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=724077

Review-Url: https://codereview.chromium.org/2903633003
Cr-Commit-Position: refs/heads/master@{#473950}
Committed:
https://chromium.googlesource.com/chromium/src/+/92ac1582b78a62c5c3d1b49c0b1e...
==========

[commit-bot: I haz the power, 2017-05-23 17:08:29]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/92ac1582b78a62c5c3d1b49c0b1e...