Make the NaCl windows 64 bit binaries not depend on chrome targets.

chrome/installer/mini_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.
     'msvs_use_common_release': 0,
     'msvs_use_common_linker_extras': 0,
   },
   'includes': [
@@ skipping 174 matching lines @@
               'extension': 'release',
               'variables': {
                 'create_installer_archive_py_path':
                   '../tools/build/win/create_installer_archive.py',
               },
               'inputs': [
                 '<(create_installer_archive_py_path)',
                 '<(PRODUCT_DIR)/chrome.exe',
                 '<(PRODUCT_DIR)/chrome.dll',
                 '<(PRODUCT_DIR)/nacl64.exe',
-                '<(PRODUCT_DIR)/nacl64.dll',
                 '<(PRODUCT_DIR)/ppGoogleNaClPluginChrome.dll',
                 '<(PRODUCT_DIR)/nacl_irt_x86_32.nexe',
                 '<(PRODUCT_DIR)/nacl_irt_x86_64.nexe',
                 '<(PRODUCT_DIR)/locales/en-US.pak',
                 '<(PRODUCT_DIR)/icudt.dll',
               ],
               'outputs': [
                 'xxx.out',
                 '<(PRODUCT_DIR)/<(RULE_INPUT_NAME).7z',
                 '<(PRODUCT_DIR)/<(RULE_INPUT_NAME).packed.7z',
@@ skipping 23 matching lines @@
       'variables': {
          'branding_dir': '../app/theme/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': '../app/theme/chromium',
       },
     }],
   ],
 }