weblayer, skew: Temporarily remove GOMA compilation for Weblayer

instrumentation tests

I temporarily need to remove GOMA compilation. I can't seem to start
the GOMA proxy when running the recipe locally. I will be working with
LUCI users in order to figure out what to do for that. For the time
being I can work around this issue by removing GOMA compilation.

Bug: 1041619
Change-Id: Idab34e78b2ec0f6c8ea7e5517bb709096ed1aef1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346939Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Rakib Hasan <rmhasan@google.com>
Cr-Commit-Position: refs/heads/master@{#796895}

weblayer/browser/android/javatests/skew/mb_config.pyl

@@ -65,9 +65,10 @@
     'release': {
       'gn_args': 'is_debug=false',
     },
-
+    # TODO(rmhasan): Add back GOMA support when you can start the goma proxy
+    # in a recipe.
     'release_bot': {
-      'mixins': ['release', 'static', 'goma'],
+      'mixins': ['release', 'static'],
     },
 
     'static': {