Promote Linux32 Debug (ARM) bot to main waterfall

Cleanup unused MB entry and enable in CQ.

BUG=webrtc:7090
NOTRY=True
TBR=kjellander@webrtc.org

Change-Id: Ie7447b343bd3304b18abed6ca5d9db4e9df94b1d
Reviewed-on: https://chromium-review.googlesource.com/514027
Commit-Queue: Henrik Kjellander <kjellander@chromium.org>
Reviewed-by: Henrik Kjellander <kjellander@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#18262}
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index d938438..b15b5c9 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -51,8 +51,7 @@
       builders { name: "ios_api_framework" }
       # TODO(kjellander): Re-enable when https://bugs.webrtc.org/7413 is fixed.
       #builders { name: "linux32_rel" }
-      # TODO(kjellander): Add when bugs.webrtc.org/7090 is fixed.
-      #builders { name: "linux32_arm_dbg" }
+      builders { name: "linux32_arm_dbg" }
       builders { name: "linux32_arm_rel" }
       builders { name: "linux_arm64_dbg" }
       builders { name: "linux_arm64_rel" }
diff --git a/tools_webrtc/mb/mb_config.pyl b/tools_webrtc/mb/mb_config.pyl
index b0347e0..2577260 100644
--- a/tools_webrtc/mb/mb_config.pyl
+++ b/tools_webrtc/mb/mb_config.pyl
@@ -94,8 +94,6 @@
       'Mac (swarming)': 'release_bot_x64',
 
       # Linux
-      # TODO(kjellander): Remove when bugs.webrtc.org/7090 is fixed.
-      'Linux32 Debug (ARM)': 'debug_bot_arm',
       'Linux64 GCC': 'gcc_release_bot_x64',
       'Linux (swarming)': 'release_bot_x64',