Reland "Remove the 'gyp_config' concept from MB."

tools/mb/mb_config.pyl

 # Copyright 2015 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.
 
 {
   # This is the list of configs that you can pass to mb; each config
   # represents a particular combination of GYP_DEFINES/gn args that
   # we must support. A given config *may* be platform-specific but
   # is not necessarily so (i.e., we might have mac, win, and linux
   # bots all using the 'gn_release_bot' config).
@@ skipping 141 matching lines @@
       'gyp_crosscompile': True,
     },
 
     'dcheck_always_on': {
       'gn_args': 'dcheck_always_on=true',
       'gyp_defines': 'dcheck_always_on=1',
     },
 
     'debug': {
       'gn_args': 'is_debug=true',
-      'gyp_config': 'Debug',
     },
 
     'debug_bot': {
       'mixins': ['debug', 'shared', 'goma'],
     },
 
     'debug_bot_minimal_symbols': {
       'mixins': ['debug_bot', 'minimal_symbols'],
     },
 
@@ skipping 74 matching lines @@
     # were picked such that if someone did try to run MB, both GN and GYP
     # should error out.
     'none': {
       'gn_args': 'error',
       'gyp_defines': 'target_arch=unknown',
     },
 
     'official': {
       'gn_args': 'is_chrome_branded is_official_build=true is_debug=false is_component_build=false',
       'gyp_defines': 'branding="Chrome" buildtype="Official" component=static_library',
-      'gyp_config': 'Release',
     },
 
     'release': {
       'gn_args': 'is_debug=false',
-      'gyp_config': 'Release',
     },
 
     'release_bot': {
       'mixins': ['release', 'static', 'goma'],
     },
 
     'release_bot_minimal_symbols': {
       'mixins': ['release_bot', 'minimal_symbols'],
     },
 
@@ skipping 179 matching lines @@
       'win8_chromium_gn_rel': 'gn_release_trybot_x86',
       'win8_chromium_gn_upload': 'gn_release_bot_minimal_symbols',
       'win_clang_x64_dbg': 'win_clang_debug_bot',
     },
     'tryserver.v8': {
       'v8_linux_chromium_gn_rel': 'gn_release_trybot',
       'v8_android_chromium_gn_dbg': 'android_gn_debug_bot',
     },
   },
 }