Support references to args files in MB.

tools/mb/mb_config.pyl

Index: tools/mb/mb_config.pyl
diff --git a/tools/mb/mb_config.pyl b/tools/mb/mb_config.pyl
index 9e1a41626639c2c0026bf7693dca1e9cfaa4a243..df72900445a6f3087f7c972e1f650bfe6aed41d9 100644
--- a/tools/mb/mb_config.pyl
+++ b/tools/mb/mb_config.pyl
@@ -562,7 +562,7 @@
     },
 
     'official.desktop': {
-      'blimp-engine': 'gn_blimp_debug',
+      'blimp-engine': '//build/args/bots/official.desktop/blimp-engine.gn',
       'mac64': 'gyp_official',
       'precise64': 'gn_official',
 
@@ -1020,13 +1020,6 @@
       'error',
     ],
 
-    # This is the "deployment" config for the blimp builds. Currently
-    # we want them to be debug, non-optimized builds (and we don't need any
-    # chrome branding), so we don't use the "official" mixin.
-    'gn_blimp_debug': [
-      'gn', 'blimp', 'debug',
-    ],
-
     'gn_cfi_release_bot': [
       'gn', 'cfi', 'release_bot',
     ],
@@ -1547,16 +1540,6 @@
       'gyp_defines': 'asan=1',
     },
 
-    # Removes dependencies on X11 and audio libraries for a containerized
-    # build.
-    'blimp': {
-      'gn_args': ('use_aura=true use_ozone=true use_alsa=false '
-                  'use_pulseaudio=false use_cups=false use_glib=false '
-                  'use_low_quality_image_interpolation=true'),
-      'gyp_defines': ('use_aura=1 use_ozone=1 use_alsa=0 '
-                      'use_pulseaudio=0 use_cups=0 use_glib=0'),
-    },
-
     'cast': {
       'gn_args': 'is_chromecast=true',
       'gyp_defines': 'chromecast=1',