Remove rendundant use of product_name in gyp files.

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'
       ],
       'xcode_settings': {
         'INFOPLIST_FILE': 'example/Info.plist',
       },
       'sources': [
         'example/example.cc',
       ],
       'conditions': [
         ['OS=="win"', {
-          'product_name': 'ppapi_example',
           'type': 'shared_library',
           'msvs_guid': 'EE00E36E-9E8C-4DFB-925E-FBE32CEDB91B',
           'sources': [
             'example/example.rc',
           ],
           'run_as': {
             'action': [
               '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)chrome<(EXECUTABLE_SUFFIX)',
               '--register-pepper-plugins=$(TargetPath);application/x-ppapi-example',
               'file://$(ProjectDir)/example/example.html',
             ],
           },
         }],
         ['os_posix == 1 and OS != "mac"', {
-          'product_name': 'ppapi_example',
           'type': 'shared_library',
           'cflags': ['-fvisibility=hidden'],
           # -gstabs, used in the official builds, causes an ICE. Simply remove
           # it.
           'cflags!': ['-gstabs'],
         }],
         ['OS=="mac"', {
           'type': 'loadable_module',
           'mac_bundle': 1,
           'product_name': 'PPAPIExample',
@@ skipping 263 matching lines @@
         'proxy/plugin_dispatcher_unittest.cc',
         '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',
       ],
     },
   ],
 }