More MB fixes in preparation for flipping Linux bots to use MB.

More MB fixes in preparation for flipping Linux bots to use MB.

Two more changes. One, importantly, changes the GYP_DEFINE to
enable goma from 'goma=1' to 'use_goma=1'.

The other fixes the linux_full_bisect_builder to mirror the waterfall
bot config and not the tryserver config, and so DCHECKs will not be
enabled.

R=brettw@chromium.org
BUG=481692
Committed: https://crrev.com/0f43d2c299172e6fd24230edafe1b7c90f6c8f1a
Cr-Commit-Position: refs/heads/master@{#343101}

[Dirk Pranke, 2015-08-12 20:00:56]

The CQ bit was checked by dpranke@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-12 20:01:13]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1291803004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1291803004/1

[commit-bot: I haz the power, 2015-08-12 21:20:45]

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

[commit-bot: I haz the power, 2015-08-12 21:20:46]

Dry run: This issue passed the CQ dry run.

[brettw, 2015-08-12 21:27:25]

lgtm

[Dirk Pranke, 2015-08-12 21:36:05]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-08-12 21:36:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1291803004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1291803004/1

[commit-bot: I haz the power, 2015-08-12 21:41:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-12 21:41:52]

Patchset 1 (id:??) landed as
https://crrev.com/0f43d2c299172e6fd24230edafe1b7c90f6c8f1a
Cr-Commit-Position: refs/heads/master@{#343101}