Use the platform_util_win implementation from Chromium.

atom.gyp

@@ -121,8 +121,9 @@
       'common/node_bindings_mac.mm',
       'common/options_switches.cc',
       'common/options_switches.h',
-      'common/platform_util_mac.mm',
       'common/platform_util.h',
+      'common/platform_util_mac.mm',
+      'common/platform_util_win.cc',
       'common/v8_value_converter_impl.cc',
       'common/v8_value_converter_impl.h',
       'renderer/api/atom_api_renderer_ipc.cc',

common.gypi

@@ -61,6 +61,7 @@
     'msvs_cygwin_shell': 0, # Strangely setting it to 1 would make building under cygwin fail.
     'msvs_disabled_warnings': [
       4005,  # (node.h) macro redefinition
+      4189,  # local variable is initialized but not referenced
       4201,  # (uv.h) nameless struct/union
       4800,  # (v8.h) forcing value to bool 'true' or 'false'
       4819,  # The file contains a character that cannot be represented in the current code page