Always build dump_syms with the 'host' toolchain

Always build dump_syms with the 'host' toolchain

A recent change set linux_dump_symbols=1 on the trybots
and was then reverted:
https://codereview.chromium.org/1081103005

The causes the ARM/Linux builder to fail since it was
attempting to run the target (ARM) dump_syms binary on
x86. This change makes dump_syms a host binary so that
it can run at build time.

BUG=476781
TEST=linux_arm_compile trybot

Committed: https://crrev.com/fe4acac6ff5547d7674e6681c9b556528520fdf7
Cr-Commit-Position: refs/heads/master@{#325661}

[Sam Clegg, 2015-04-15 01:35:36]

sbc@chromium.org changed reviewers:
+ thestig@chromium.org

[Sam Clegg, 2015-04-15 01:47:40]

On 2015/04/15 01:35:36, Sam Clegg wrote:

I'm assuming dump_syms is only used during the build.. and not on the target?

[Lei Zhang, 2015-04-15 03:54:44]

On 2015/04/15 01:47:40, Sam Clegg wrote:
> On 2015/04/15 01:35:36, Sam Clegg wrote:
> 
> I'm assuming dump_syms is only used during the build.. and not on the target?

AFAIK, dump_app_syms is the wrapper that runs dump_syms, and that's on the host,
so lgtm. Anyone who needs to build dump_syms for a specific target can do it
from a Breakpad checkout.

[Sam Clegg, 2015-04-15 17:14:21]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2015-04-15 17:14:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1061473003/40001

[commit-bot: I haz the power, 2015-04-15 17:23:39]

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

[commit-bot: I haz the power, 2015-04-15 17:23:40]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Sam Clegg, 2015-04-15 17:26:26]

sbc@chromium.org changed reviewers:
+ jochen@chromium.org

[Sam Clegg, 2015-04-15 17:26:36]

+jochen for build/OWNERS

[jochen (gone - plz use gerrit), 2015-04-17 09:23:47]

lgtm

[Sam Clegg, 2015-04-17 16:12:19]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2015-04-17 16:13:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1061473003/40001

[commit-bot: I haz the power, 2015-04-17 17:23:58]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-04-17 17:25:00]

Patchset 3 (id:??) landed as
https://crrev.com/fe4acac6ff5547d7674e6681c9b556528520fdf7
Cr-Commit-Position: refs/heads/master@{#325661}