Update Chomium's build files to work w/ latest GN binaries.

ppapi/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.
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("ppapi_sources.gypi") ],
                           "scope",
                           [ "ppapi_sources.gypi" ])
 
 # TODO(GYP) support chrome_multiple_dll
@@ skipping 371 matching lines @@
       "thunk/ppb_platform_verification_private_thunk.cc",
       "thunk/ppb_scrollbar_thunk.cc",
       "thunk/ppb_talk_private_thunk.cc",
       "thunk/ppb_url_util_thunk.cc",
       "thunk/ppb_video_decoder_dev_thunk.cc",
     ]
   }
 
   # We exclude a few more things for nacl_win64, to avoid pulling in more
   # dependencies.
-  if (is_win && cpu_arch == "x64" && current_toolchain != default_toolchain) {
+  if (is_win && current_cpu == "x64" && current_toolchain != default_toolchain) {

[brettw, 2015/02/12 18:04:31]

Seems like you need to run "gn format" on this change.

     sources -= [
       "shared_impl/ppb_audio_shared.cc",
       "shared_impl/ppb_graphics_3d_shared.cc",
       "shared_impl/ppb_opengles2_shared.cc",
       "shared_impl/private/ppb_host_resolver_shared.cc",
       "shared_impl/private/net_address_private_impl.cc",
       "thunk/ppb_graphics_3d_thunk.cc",
       "thunk/ppb_host_resolver_private_thunk.cc",
       "thunk/ppb_tcp_server_socket_private_thunk.cc",
       "thunk/ppb_tcp_socket_private_thunk.cc",
@@ skipping 409 matching lines @@
     ":ppapi_proxy",
     ":ppapi_shared",
     "//base/test:test_support",
     "//ipc",
     "//ipc:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }
 # TODO(GYP) other targets from ppapi_tests.gyp