Revert of Make ProfileIOData's ProxyService fetch PACs with the main URLRequestContext

Revert of Make ProfileIOData's ProxyService fetch PACs with the main URLRequestContext (patchset #11 id:340001 of https://codereview.chromium.org/2841163002/ )

Reason for revert:
This ran into a race with extension setup.  Have a CL out to fix that, but reverting this in the meantime.  I'll plan to TBR the reland, since this bug this tickled has no real relation to any code in this CL, but is a pre-existing issue in other code that this tickled.

Original issue's description:
> Make ProfileIOData's ProxyService fetch PACs with the main URLRequestContext.
> 
> This is intended to make servicification a little simpler, since we won't
> have to configure a secret global URLRequestContext used just to fetch PAC
> scripts.
> 
> The system URLRequestContext will be updated in a similar manner in a
> followup CL.
> 
> BUG=715697
> 
> Review-Url: https://codereview.chromium.org/2841163002
> Cr-Commit-Position: refs/heads/master@{#469044}
> Committed: https://chromium.googlesource.com/chromium/src/+/0a8ca0d1e3ac86cd1d0955fc66a43aaa1eaf7393

TBR=eroman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=715697

[mmenke, 2017-05-11 15:49:16]

The CQ bit was checked by mmenke@chromium.org

[mmenke, 2017-05-11 15:49:16]

Created Revert of Make ProfileIOData's ProxyService fetch PACs with the main
URLRequestContext

[commit-bot: I haz the power, 2017-05-11 15:49:56]

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, 2017-05-11 15:54:25]

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

[commit-bot: I haz the power, 2017-05-11 15:54:26]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_arm6...)
  android_compile_dbg on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_comp...)
  cast_shell_android on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/cast_shell_a...)
  linux_android_rel_ng on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/linux_androi...)

[mmenke, 2017-05-12 18:22:49]

Seems too late to bother landing this now - hope to get a fix in on Monday.

[mmenke, 2017-05-12 18:23:00]

Description was changed from

==========
Revert of Make ProfileIOData's ProxyService fetch PACs with the main
URLRequestContext (patchset #11 id:340001 of
https://codereview.chromium.org/2841163002/ )

Reason for revert:
This ran into a race with extension setup.  Have a CL out to fix that, but
reverting this in the meantime.  I'll plan to TBR the reland, since this bug
this tickled has no real relation to any code in this CL, but is a pre-existing
issue in other code that this tickled.

Original issue's description:
> Make ProfileIOData's ProxyService fetch PACs with the main URLRequestContext.
> 
> This is intended to make servicification a little simpler, since we won't
> have to configure a secret global URLRequestContext used just to fetch PAC
> scripts.
> 
> The system URLRequestContext will be updated in a similar manner in a
> followup CL.
> 
> BUG=715697
> 
> Review-Url: https://codereview.chromium.org/2841163002
> Cr-Commit-Position: refs/heads/master@{#469044}
> Committed:
https://chromium.googlesource.com/chromium/src/+/0a8ca0d1e3ac86cd1d0955fc66a4...

TBR=eroman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=715697
==========

to

==========
Revert of Make ProfileIOData's ProxyService fetch PACs with the main
URLRequestContext (patchset #11 id:340001 of
https://codereview.chromium.org/2841163002/ )

Reason for revert:
This ran into a race with extension setup.  Have a CL out to fix that, but
reverting this in the meantime.  I'll plan to TBR the reland, since this bug
this tickled has no real relation to any code in this CL, but is a pre-existing
issue in other code that this tickled.

Original issue's description:
> Make ProfileIOData's ProxyService fetch PACs with the main URLRequestContext.
> 
> This is intended to make servicification a little simpler, since we won't
> have to configure a secret global URLRequestContext used just to fetch PAC
> scripts.
> 
> The system URLRequestContext will be updated in a similar manner in a
> followup CL.
> 
> BUG=715697
> 
> Review-Url: https://codereview.chromium.org/2841163002
> Cr-Commit-Position: refs/heads/master@{#469044}
> Committed:
https://chromium.googlesource.com/chromium/src/+/0a8ca0d1e3ac86cd1d0955fc66a4...

TBR=eroman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=715697
==========