Revert of Disable local fallback in goma staging environment

scripts/slave/recipe_modules/chromium/config.py

 # Copyright 2013 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.
 
 import pipes
 
 from recipe_engine.config import config_item_context, ConfigGroup
 from recipe_engine.config import Dict, List, Single, Static, Set, BadConf
 from recipe_engine.config_types import Path
 
@@ skipping 21 matching lines @@
                BUILD_CONFIG, TARGET_CROS_BOARD,
                BUILD_PATH, CHECKOUT_PATH, **_kwargs):
   equal_fn = lambda tup: ('%s=%s' % (tup[0], pipes.quote(str(tup[1]))))
   return ConfigGroup(
     compile_py = ConfigGroup(
       default_targets = Set(basestring),
       build_args = Single(basestring, required=False),
       compiler = Single(basestring, required=False),
       mode = Single(basestring, required=False),
       goma_dir = Single(Path, required=False),
-      goma_failfast = Single(bool, empty_val=False, required=False),
+      goma_canary = Single(bool, empty_val=False, required=False),
       goma_hermetic = Single(basestring, required=False),
       goma_enable_remote_link = Single(bool, empty_val=False, required=False),
       goma_store_local_run_output = Single(bool, empty_val=False, required=False),
       xcode_sdk = Single(basestring, required=False),
       ninja_confirm_noop = Single(bool, empty_val=False, required=False),
       set_build_data_dir = Single(bool, empty_val=False, required=False),
     ),
     runtest_py = ConfigGroup(
       src_side = Single(bool),
     ),
@@ skipping 188 matching lines @@
 @config_ctx()
 def msvs2013(c):
   c.gyp_env.GYP_MSVS_VERSION = '2013'
 
 @config_ctx()
 def msvs2015(c):
   c.gyp_env.GYP_MSVS_VERSION = '2015'
 
 @config_ctx()
 def goma_canary(c):
-  c.compile_py.goma_failfast = True
+  c.compile_py.goma_canary = True
   c.compile_py.goma_hermetic = 'error'
 
 @config_ctx()
 def goma_staging(c):
-  c.compile_py.goma_failfast = True
   c.env.GOMA_STUBBY_PROXY_IP_ADDRESS = 'sandbox.google.com'
 
 @config_ctx()
 def goma_hermetic_fallback(c):
   c.compile_py.goma_hermetic = 'fallback'
 
 @config_ctx()
 def goma_linktest(c):
   c.compile_py.goma_enable_remote_link = True
   c.compile_py.goma_store_local_run_output = True
@@ skipping 532 matching lines @@
   c.gyp_env.GYP_DEFINES['internal_gles2_conform_tests'] = 1
 
 @config_ctx()
 def build_angle_deqp_tests(c):
   c.gyp_env.GYP_DEFINES['build_angle_deqp_tests'] = 1
 
 @config_ctx()
 def force_mac_toolchain(c):
   c.env.FORCE_MAC_TOOLCHAIN = 1
   c.gyp_env.FORCE_MAC_TOOLCHAIN = 1