Revert of V8: Remove obsolete environment variables

Revert of V8: Remove obsolete environment variables (patchset #1 id:1 of https://codereview.chromium.org/2074403002/ )

Reason for revert:
Breaks internal...

Original issue's description:
> V8: Remove obsolete environment variables
> 
> The target compiler for arm is controlled in v8's gyp files
> now.
> 
> BUG=474921
> 
> Committed: https://chromium.googlesource.com/chromium/tools/build/+/4e6b1681e8c0a5674c5d5f6ad3acd403dedba3e7

TBR=jochen@chromium.org,kjellander@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=474921
Committed: https://chromium.googlesource.com/chromium/tools/build/+/b12321a5304f334985b1092d9ac141e69ef20af8

[Michael Achenbach, 2016-06-20 12:04:10]

The CQ bit was checked by machenbach@chromium.org

[Michael Achenbach, 2016-06-20 12:04:10]

Created Revert of V8: Remove obsolete environment variables

[commit-bot: I haz the power, 2016-06-20 12:04:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2084523002/1

[commit-bot: I haz the power, 2016-06-20 12:04:26]

Description was changed from

==========
Revert of V8: Remove obsolete environment variables (patchset #1 id:1 of
https://codereview.chromium.org/2074403002/ )

Reason for revert:
Breaks internal...

Original issue's description:
> V8: Remove obsolete environment variables
> 
> The target compiler for arm is controlled in v8's gyp files
> now.
> 
> BUG=474921
> 
> Committed:
https://chromium.googlesource.com/chromium/tools/build/+/4e6b1681e8c0a5674c5d...

TBR=jochen@chromium.org,kjellander@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=474921
==========

to

==========
Revert of V8: Remove obsolete environment variables (patchset #1 id:1 of
https://codereview.chromium.org/2074403002/ )

Reason for revert:
Breaks internal...

Original issue's description:
> V8: Remove obsolete environment variables
> 
> The target compiler for arm is controlled in v8's gyp files
> now.
> 
> BUG=474921
> 
> Committed:
https://chromium.googlesource.com/chromium/tools/build/+/4e6b1681e8c0a5674c5d...

TBR=jochen@chromium.org,kjellander@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=474921

Committed:
https://chromium.googlesource.com/chromium/tools/build/+/b12321a5304f334985b1...
==========

[commit-bot: I haz the power, 2016-06-20 12:04:27]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/tools/build/+/b12321a5304f334985b1...

[kjellander_chromium, 2016-06-20 13:33:35]

lgtm