Link client apps against base_static.lib

This is required to get base::win::PEImage, which is required by sandboxing
code.

* vendor/libchromiumcontent c973a7c...04ccdd8 (1):
  > Export base_static.lib for Windows clients

brightray/brightray.gyp

@@ -74,6 +74,7 @@
         ['OS=="win"', {
           'link_settings': {
             'libraries': [
+              '<(libchromiumcontent_library_dir)/base_static.lib',
               '<(libchromiumcontent_library_dir)/chromiumcontent.dll.lib',
               '<(libchromiumcontent_library_dir)/sandbox_static.lib',
             ],