Revert of Fix double-building of v8 in GN builds when setting just v8_target_cpu.

Revert of Fix double-building of v8 in GN builds when setting just v8_target_cpu. (patchset #1 id:1 of https://codereview.chromium.org/2166173002/ )

Reason for revert:
Breaks:
https://build.chromium.org/p/client.v8.fyi/builders/V8%20Android%20GN%20%28dbg%29/builds/4590

And also the trybot:
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clang_dbg_recipe/builds/99806

Original issue's description:
> Fix double-building of v8 in GN builds when setting just v8_target_cpu.
>
> Because of the somewhat strange way default toolchains and custom
> toolchains and user-specified arguments work in GN, if you did a v8
> build that just set v8_target_cpu, you could end up building two
> identical copies of v8 (see the comments in the change for more).
>
> This CL identifies that case and fixes it.
>
> R=machenbach@chromium.org
> BUG=629825
>
> Committed: https://crrev.com/3536db45c9409c9aadc4eee6004cf337c0588cdb
> Cr-Commit-Position: refs/heads/master@{#37926}

TBR=dpranke@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=629825
Committed: https://crrev.com/f6f8062fca1625902e6c32a71f113b3b98cfafe3
Cr-Commit-Position: refs/heads/master@{#37936}

[Michael Achenbach, 2016-07-21 10:52:39]

The CQ bit was checked by machenbach@chromium.org

[Michael Achenbach, 2016-07-21 10:52:39]

Created Revert of Fix double-building of v8 in GN builds when setting just
v8_target_cpu.

[commit-bot: I haz the power, 2016-07-21 10:52:45]

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, 2016-07-21 10:52:57]

Description was changed from

==========
Revert of Fix double-building of v8 in GN builds when setting just
v8_target_cpu. (patchset #1 id:1 of https://codereview.chromium.org/2166173002/
)

Reason for revert:
Breaks:
https://build.chromium.org/p/client.v8.fyi/builders/V8%20Android%20GN%20%28db...

And also the trybot:
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clan...

Original issue's description:
> Fix double-building of v8 in GN builds when setting just v8_target_cpu.
> 
> Because of the somewhat strange way default toolchains and custom
> toolchains and user-specified arguments work in GN, if you did a v8
> build that just set v8_target_cpu, you could end up building two
> identical copies of v8 (see the comments in the change for more).
> 
> This CL identifies that case and fixes it.
> 
> R=machenbach@chromium.org
> BUG=629825
> 
> Committed: https://crrev.com/3536db45c9409c9aadc4eee6004cf337c0588cdb
> Cr-Commit-Position: refs/heads/master@{#37926}

TBR=dpranke@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=629825
==========

to

==========
Revert of Fix double-building of v8 in GN builds when setting just
v8_target_cpu. (patchset #1 id:1 of https://codereview.chromium.org/2166173002/
)

Reason for revert:
Breaks:
https://build.chromium.org/p/client.v8.fyi/builders/V8%20Android%20GN%20%28db...

And also the trybot:
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clan...

Original issue's description:
> Fix double-building of v8 in GN builds when setting just v8_target_cpu.
> 
> Because of the somewhat strange way default toolchains and custom
> toolchains and user-specified arguments work in GN, if you did a v8
> build that just set v8_target_cpu, you could end up building two
> identical copies of v8 (see the comments in the change for more).
> 
> This CL identifies that case and fixes it.
> 
> R=machenbach@chromium.org
> BUG=629825
> 
> Committed: https://crrev.com/3536db45c9409c9aadc4eee6004cf337c0588cdb
> Cr-Commit-Position: refs/heads/master@{#37926}

TBR=dpranke@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=629825
==========

[commit-bot: I haz the power, 2016-07-21 10:52:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-21 10:56:10]

Description was changed from

==========
Revert of Fix double-building of v8 in GN builds when setting just
v8_target_cpu. (patchset #1 id:1 of https://codereview.chromium.org/2166173002/
)

Reason for revert:
Breaks:
https://build.chromium.org/p/client.v8.fyi/builders/V8%20Android%20GN%20%28db...

And also the trybot:
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clan...

Original issue's description:
> Fix double-building of v8 in GN builds when setting just v8_target_cpu.
> 
> Because of the somewhat strange way default toolchains and custom
> toolchains and user-specified arguments work in GN, if you did a v8
> build that just set v8_target_cpu, you could end up building two
> identical copies of v8 (see the comments in the change for more).
> 
> This CL identifies that case and fixes it.
> 
> R=machenbach@chromium.org
> BUG=629825
> 
> Committed: https://crrev.com/3536db45c9409c9aadc4eee6004cf337c0588cdb
> Cr-Commit-Position: refs/heads/master@{#37926}

TBR=dpranke@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=629825
==========

to

==========
Revert of Fix double-building of v8 in GN builds when setting just
v8_target_cpu. (patchset #1 id:1 of https://codereview.chromium.org/2166173002/
)

Reason for revert:
Breaks:
https://build.chromium.org/p/client.v8.fyi/builders/V8%20Android%20GN%20%28db...

And also the trybot:
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clan...

Original issue's description:
> Fix double-building of v8 in GN builds when setting just v8_target_cpu.
>
> Because of the somewhat strange way default toolchains and custom
> toolchains and user-specified arguments work in GN, if you did a v8
> build that just set v8_target_cpu, you could end up building two
> identical copies of v8 (see the comments in the change for more).
>
> This CL identifies that case and fixes it.
>
> R=machenbach@chromium.org
> BUG=629825
>
> Committed: https://crrev.com/3536db45c9409c9aadc4eee6004cf337c0588cdb
> Cr-Commit-Position: refs/heads/master@{#37926}

TBR=dpranke@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=629825

Committed: https://crrev.com/f6f8062fca1625902e6c32a71f113b3b98cfafe3
Cr-Commit-Position: refs/heads/master@{#37936}
==========

[commit-bot: I haz the power, 2016-07-21 10:56:11]

Patchset 1 (id:??) landed as
https://crrev.com/f6f8062fca1625902e6c32a71f113b3b98cfafe3
Cr-Commit-Position: refs/heads/master@{#37936}

[Dirk Pranke, 2016-07-21 17:19:02]

lgtm