Revert of GN: support 32-bit x86 builds

infra/bots/recipes/swarm_compile.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 # Recipe module for Skia Swarming compile.
 
 
 DEPS = [
   'core',
@@ skipping 247 matching lines @@
             retcode=1)
         if 'Trybot' in builder:
           test += api.properties(issue=500,
                                  patchset=1,
                                  rietveld='https://codereview.chromium.org')
 
         yield test
 
   mastername = 'client.skia.compile'
   slavename = 'skiabot-win-compile-000'
-  buildername = 'Build-Ubuntu-GCC-x86_64-Debug'
+  buildername = 'Build-Ubuntu-GCC-x86-Debug'
   yield (
       api.test('failed_compile') +
       api.properties(buildername=buildername,
                      mastername=mastername,
                      slavename=slavename,
                      buildnumber=5,
                      revision='abc123',
                      path_config='kitchen',
                      swarm_out_dir='[SWARM_OUT_DIR]') +
       api.path.exists(
@@ skipping 49 matching lines @@
           buildername=buildername + '-Trybot',
           mastername=mastername,
           slavename=slavename,
           buildnumber=5,
           path_config='kitchen',
           swarm_out_dir='[SWARM_OUT_DIR]',
           revision='abc123',
           **gerrit_kwargs) +
       api.platform('win', 64)
   )