Removes files from //build that we don't need

build/win_precompile.gypi

-# Copyright (c) 2011 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.
-
-# Include this file to make targets in your .gyp use the default
-# precompiled header on Windows, in debug builds only as the official
-# builders blow up (out of memory) if precompiled headers are used for
-# release builds.
-
-{
-  'conditions': [
-    ['OS=="win" and chromium_win_pch==1', {
-        'target_defaults': {
-          'msvs_precompiled_header': '<(DEPTH)/build/precompile.h',
-          'msvs_precompiled_source': '<(DEPTH)/build/precompile.cc',
-          'sources': ['<(DEPTH)/build/precompile.cc'],
-        }
-      }],
-  ],
-}