Revert of Add debug symbols to all generated .isolate (bis).

Revert of Add debug symbols to all generated .isolate (bis). (patchset #2 id:20001 of https://codereview.chromium.org/1350413002/ )

Reason for revert:
Broke many Mac tests, such as: https://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests%20%28dbg%29/builds/12106

Original issue's description:
> Add debug symbols to all generated .isolate (bis).
>
> This will increase the amount of data being uploaded by a ~2x factor or so.
> Debug symbols are usually larger than the executable itself on pretty much all
> toolsets but generally have the advantage of being highly compressible. The
> increase of data not a problem anymore with isolate-go. There will be a small
> increase of latency but it should be bearable, especially by the gain of
> enabling stack traces to work for isolated tests on Swarming.
>
> R=jam@chromium.org
> BUG=98637
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
>
> Committed: https://crrev.com/aad3ded46d115f94f1c501c5b21fa1ef73ef771b
> Cr-Commit-Position: refs/heads/master@{#349953}

TBR=jam@chromium.org,maruel@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=98637
Committed: https://crrev.com/f69e429c7c50d1243c72d78a17fb308e0d7a7668
Cr-Commit-Position: refs/heads/master@{#349983}

[paulmeyer, 2015-09-21 18:56:39]

Created Revert of Add debug symbols to all generated .isolate (bis).

[commit-bot: I haz the power, 2015-09-21 18:56:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1359703002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1359703002/1

[commit-bot: I haz the power, 2015-09-21 18:58:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-21 18:59:58]

Patchset 1 (id:??) landed as
https://crrev.com/f69e429c7c50d1243c72d78a17fb308e0d7a7668
Cr-Commit-Position: refs/heads/master@{#349983}