Add unit test for chrome\installer\util\version

chrome/installer/installer.gyp

 {
   'variables': {
     'version_py': '../../chrome/tools/build/version.py',
     'version_path': '../../chrome/VERSION',
     'lastchange_path': '<(SHARED_INTERMEDIATE_DIR)/build/LASTCHANGE',
     # 'branding_dir' is set in the 'conditions' section at the bottom.
   },
   'includes': [
     '../../build/common.gypi',
   ],
@@ skipping 256 matching lines @@
             'util/delete_reg_value_work_item_unittest.cc',
             'util/delete_tree_work_item_unittest.cc',
             'util/google_chrome_distribution_unittest.cc',
             'util/helper_unittest.cc',
             'util/installer_util_unittests.rc',
             'util/installer_util_unittests_resource.h',
             'util/move_tree_work_item_unittest.cc',
             'util/run_all_unittests.cc',
             'util/set_reg_value_work_item_unittest.cc',
             'util/work_item_list_unittest.cc',
+            'util/version_unittest.cc',
           ],
           'msvs_settings': {
             'VCManifestTool': {
               'AdditionalManifestFiles': '$(ProjectDir)\\mini_installer\\mini_installer.exe.manifest',
             },
           },
         },
         {
           'target_name': 'installer_util_strings',
           'type': 'dummy_executable',
@@ skipping 199 matching lines @@
       'variables': {
          'branding_dir': '../app/theme/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': '../app/theme/chromium',
       },
     }],
   ],
 }