Revert of Precompile more in Blink in Windows for faster compilations

Source/core/win/precompile-core.gypi

-# 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.
-
-# Include this file to make core targets in your .gyp use the default precompiled
-# header on Windows, when precompiled headers are turned on.
-
-{
-  'conditions': [
-      ['OS=="win" and chromium_win_pch==1', {
-          'target_defaults': {
-              'msvs_precompiled_header': '<(DEPTH)/third_party/WebKit/Source/core/win/Precompile-core.h',
-              'msvs_precompiled_source': '<(DEPTH)/third_party/WebKit/Source/core/win/Precompile-core.cpp',
-              'sources': ['<(DEPTH)/third_party/WebKit/Source/core/win/Precompile-core.cpp'],
-              'msvs_settings': {
-                  # Compiling the large headers in Blink hits the
-                  # default size limits in precompile header
-                  # compilation in VS2013. Here we increase the limits
-                  # to 120% of default.
-                  'VCCLCompilerTool': {
-                      'AdditionalOptions': [
-                          '-Zm120',
-                      ],
-                  },
-              },
-          }
-      }],
-  ],
-}