Revert of Add debug symbols to all generated .isolate.

Revert of Add debug symbols to all generated .isolate. (patchset #1 id:420001 of https://codereview.chromium.org/1245703002/ )

Reason for revert:
Speculative, possibly caused "dyld: Library not loaded: @rpath/libchrome_main_dll.dylib" test failures in http://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests%20%28dbg%29/builds/11859

Original issue's description:
> Add debug symbols to all generated .isolate.
>
> 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/8125ce3c695e6d8c02f3b51b16d49e17e7934bb4
> Cr-Commit-Position: refs/heads/master@{#349231}

TBR=jam@chromium.org,kbr@chromium.org,maruel@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=98637
Committed: https://crrev.com/29ea88c651e6bd8656713cfc2a8f88eff267518d
Cr-Commit-Position: refs/heads/master@{#349342}

[Nico, 2015-09-17 03:16:07]

Created Revert of Add debug symbols to all generated .isolate.

[commit-bot: I haz the power, 2015-09-17 03:16:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1354523002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1354523002/1

[commit-bot: I haz the power, 2015-09-17 03:16:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-17 03:17:50]

Patchset 1 (id:??) landed as
https://crrev.com/29ea88c651e6bd8656713cfc2a8f88eff267518d
Cr-Commit-Position: refs/heads/master@{#349342}