Revert the part of r90660 that enables building ppapi examples on win.

ppapi/ppapi_tests.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.
 
 {
   'targets': [
      {
       'target_name': 'ppapi_example',
       'dependencies': [
         'ppapi.gyp:ppapi_cpp'
@@ skipping 173 matching lines @@
         'proxy/plugin_resource_tracker_unittest.cc',
         'proxy/plugin_var_tracker_unittest.cc',
         'proxy/ppapi_proxy_test.cc',
         'proxy/ppapi_proxy_test.h',
         'proxy/serialized_var_unittest.cc',
       ],
     },
   ],
 
   'conditions': [
-    # NOTE: the PPAPI examples fail to build on mac.
+    # NOTE: the PPAPI examples fail to build on mac & windows.
     # http://code.google.com/p/chromium/issues/detail?id=54005 tracks mac.
-    ['OS!="mac"', {
+    # TODO(ppapi authors):  Make the examples build on Windows as well.  In
+    # particular previous attempts have failed because the Win(clobber) and
+    # WinShared(dbg) builds try to build all, import *.gyp:*, and "all" becomes
+    # a direct dependent of ppapi_example_skeleton, making it a shared_library,
+    # and confusing the build system into failure.
+    ['OS!="win" and OS!="mac"', {
       'targets': [
         {
           'target_name': 'ppapi_example_skeleton',
           'type': 'none',
           'direct_dependent_settings': {
             'product_name': '>(_target_name)',
             'conditions': [
               ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"', {
                 'cflags': ['-fvisibility=hidden'],
                 'type': 'shared_library',
@@ skipping 113 matching lines @@
           ],
           'sources': [
             'examples/gles2/gles2.cc',
             'examples/gles2/testdata.h',
           ],
         },
       ],
     }]
   ]
 }