Make the Mojo ChromiumOS fyi bot release+dcheck.

We used debug (component builds) to workaround Issue 594674.
Scott recently fixed mash browser tests for static builds with:
  https://codereview.chromium.org/2295433003/

Make the bot release again, but now with ozone+dchecks.
It's TBD if we need more args to make mash work with ozone:
 ozone_auto_platforms = false
 ozone_platform_x11 = true

BUG=639882,642433
TEST=Mojo ChromiumOS fyi bot does release+dcheck builds.
R=dpranke@chromium.org

Review-Url: https://codereview.chromium.org/2291013003
Cr-Commit-Position: refs/heads/master@{#415448}

tools/mb/mb_config.pyl

@@ -248,8 +248,7 @@
       'Linux remote_run Tester': 'swarming_gn_release_bot',
       'Linux V8 API Stability': 'gn_release_bot',
       'Mac deterministic': 'gn_release_bot_mac_strip',
-      # TODO(mojo): Make 'Mojo ChromiumOS' release+dcheck; see crbug.com/594674
-      'Mojo ChromiumOS': 'swarming_chromeos_gn_ozone_debug_bot',
+      'Mojo ChromiumOS': 'swarming_chromeos_gn_ozone_release_trybot',
       'Mojo Windows': 'gn_release_bot_minimal_symbols_x86',
       'Site Isolation Linux': 'gn_release_trybot',
       'Site Isolation Win': 'gn_release_trybot_x86',
@@ -1638,10 +1637,6 @@
       'swarming', 'chromeos_with_codecs', 'gn', 'debug_bot',
     ],
 
-    'swarming_chromeos_gn_ozone_debug_bot': [
-      'swarming', 'chromeos_with_codecs', 'gn', 'ozone', 'debug_bot',
-    ],
-
     'swarming_chromeos_gn_debug_trybot': [
       'swarming', 'chromeos_with_codecs', 'gn', 'debug_trybot',
     ],