Give autogen bots on chromium.fyi and client.nacl.sdk a separate clobber step

scripts/slave/recipes/chromium.fyi.misc_block.recipe_autogen.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.
 
 DEPS = [
     'chromium',
     'depot_tools/bot_update',
     'depot_tools/gclient',
+    'file',
     'recipe_engine/json',
     'recipe_engine/path',
     'recipe_engine/properties',
     'recipe_engine/python',
     'recipe_engine/step',
 ]
 
 
 def Android_ChromeDriver_Tests__dbg__steps(api):
     build_properties = api.properties.legacy()
@@ skipping 60 matching lines @@
                         'https://svn.code.sf.net/p/%(repo)s/code',
                         'llvm_url': 'http://llvm.org/svn/llvm-project'}
     src_cfg.got_revision_mapping.update(
         {'src': 'got_revision',
          'src/third_party/WebKit': 'got_webkit_revision',
          'src/tools/swarming_client': 'got_swarming_client_revision',
          'src/v8': 'got_v8_revision'})
     api.gclient.c = src_cfg
     result = api.bot_update.ensure_checkout(force=True)
     build_properties.update(result.json.output.get("properties", {}))
+
+    # clobber before runhooks
+    api.file.rmtree('clobber', api.path['checkout'].join('out', 'Release'))
+
     # gclient revert step; made unnecessary by bot_update
     # gclient update step; made unnecessary by bot_update
     # gclient runhooks wrapper step
     env = {'CHROMIUM_GYP_SYNTAX_CHECK': '1',
            'LANDMINES_VERBOSE': '1',
            'DEPOT_TOOLS_UPDATE': '0',
            'GYP_DEFINES': ' component=static_library',
            'LLVM_DOWNLOAD_GOLD_PLUGIN': '1'}
     api.python("gclient runhooks wrapper",
                api.path["build"].join("scripts", "slave",
                                       "runhooks_wrapper.py"),
                env=env)
     # cleanup_temp step
     api.chromium.cleanup_temp()
     # compile.py step
-    args = ['--target', 'Release', '--clobber', 'chromium_builder_asan']
+    args = ['--target', 'Release', 'chromium_builder_asan']
     api.python("compile",
                api.path["build"].join("scripts", "slave", "compile.py"),
                args=args)
     # ClusterFuzz Archive step
     # HACK(aneeshm): chromium_utils fails without this.
     build_properties["primary_repo"] = ""
     api.python(
         'ClusterFuzz Archive',
         api.path["build"].join("scripts", "slave", "chromium",
                                "cf_archive_build.py"),
@@ skipping 38 matching lines @@
     api.properties(revision='123456789abcdef') +
     api.properties(got_revision='123456789abcdef') +
     api.properties(buildnumber='42') +
     api.properties(slavename='TestSlave')
         )
   yield (api.test('builder_not_in_dispatch_directory') +
     api.properties(mastername='chromium.fyi') +
     api.properties(buildername='nonexistent_builder') +
     api.properties(slavename='TestSlave')
         )