recipes/win: Stop explicitly disabling precompiled headers in recipes in goma builds.

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 293 matching lines @@
     raise BadConf('goma config doesn\'t understand %s' % c.compile_py.compiler)
 
   c.gyp_env.GYP_DEFINES['use_goma'] = 1
 
   goma_dir = c.BUILD_PATH.join('goma')
   c.gyp_env.GYP_DEFINES['gomadir'] = goma_dir
   c.compile_py.goma_dir = goma_dir
 
   if c.TARGET_PLATFORM == 'win' and c.compile_py.compiler != 'goma-clang':
     fastbuild(c)
-    pch(c, invert=True)
-
-@config_ctx()
-def pch(c, invert=False):
-  if c.TARGET_PLATFORM == 'win':
-    c.gyp_env.GYP_DEFINES['chromium_win_pch'] = int(not invert)
 
 @config_ctx()
 def dcheck(c, invert=False):
   c.gyp_env.GYP_DEFINES['dcheck_always_on'] = int(not invert)
 
 @config_ctx()
 def fastbuild(c, invert=False):
   c.gyp_env.GYP_DEFINES['fastbuild'] = int(not invert)
 
 @config_ctx()
@@ skipping 488 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