Remove _use_intermediate_source_set variable.

Remove _use_intermediate_source_set variable.

As the variable is now true (it's end state), it can be removed and
the corresponding legacy code.

BUG=637065
Committed: https://crrev.com/5475013e3ff37f8882f7bf58911b655ce9ab2f04
Cr-Commit-Position: refs/heads/master@{#417316}

[sdefresne, 2016-09-06 15:24:45]

The CQ bit was checked by sdefresne@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-06 15:25:05]

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

[sdefresne, 2016-09-06 15:26:16]

The CQ bit was checked by sdefresne@chromium.org to run a CQ dry run

[sdefresne, 2016-09-06 15:26:31]

Patchset #1 (id:1) has been deleted

[commit-bot: I haz the power, 2016-09-06 15:26:41]

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

[sdefresne, 2016-09-06 15:27:49]

sdefresne@chromium.org changed reviewers:
+ olivierrobin@chromium.org

[sdefresne, 2016-09-06 15:27:50]

Please take a look.

[Olivier, 2016-09-06 15:42:07]

lgtm

[commit-bot: I haz the power, 2016-09-06 16:38:54]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-06 16:38:55]

Dry run: This issue passed the CQ dry run.

[sdefresne, 2016-09-08 15:24:43]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2016-09-08 15:25:06]

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, 2016-09-08 16:52:12]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2016-09-08 16:55:32]

Description was changed from

==========
Remove _use_intermediate_source_set variable.

As the variable is now true (it's end state), it can be removed and
the corresponding legacy code.

BUG=637065
==========

to

==========
Remove _use_intermediate_source_set variable.

As the variable is now true (it's end state), it can be removed and
the corresponding legacy code.

BUG=637065

Committed: https://crrev.com/5475013e3ff37f8882f7bf58911b655ce9ab2f04
Cr-Commit-Position: refs/heads/master@{#417316}
==========

[commit-bot: I haz the power, 2016-09-08 16:55:34]

Patchset 1 (id:??) landed as
https://crrev.com/5475013e3ff37f8882f7bf58911b655ce9ab2f04
Cr-Commit-Position: refs/heads/master@{#417316}