Revert "Add precompiled headers to GN build for large targets."

chrome/browser/extensions/BUILD.gn

 # Copyright 2014 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("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 assert(enable_extensions)
 
 gypi_values =
     exec_script("//build/gypi_to_gn.py",
                 [ rebase_path("../../chrome_browser_extensions.gypi") ],
                 "scope",
                 [ "../../chrome_browser_extensions.gypi" ])
 
 # GYP version: chrome/chrome_browser_extensions.gypi:browser_extensions
 source_set("extensions") {
   sources = []
   sources += rebase_path(gypi_values.chrome_browser_extensions_enabled_sources,
                          ".",
                          "//chrome")
 
-  configs += [ "//build/config:precompiled_headers" ]
   defines = []
 
   # Since browser and browser_extensions actually depend on each other,
   # we must omit the dependency from browser_extensions to browser.
   # However, this means browser_extensions and browser should more or less
   # have the same dependencies. Once browser_extensions is untangled from
   # browser, then we can clean up these dependencies.
   public_deps = [
     "//chrome/common/extensions/api",
     "//content/public/browser",
@@ skipping 168 matching lines @@
                     "//chrome")
   }
 
   if (is_chromeos && use_ozone) {
     sources -= [ "global_shortcut_listener_chromeos.cc" ]
   }
   if (!use_ozone) {
     sources -= [ "global_shortcut_listener_ozone.cc" ]
   }
 }