Another go at switching mini_installer to gyp.

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 292 matching lines @@
           'direct_dependent_settings': {
             'include_dirs': [
                '<(SHARED_INTERMEDIATE_DIR)/installer_util_strings',
             ],
           },
         },
         {
           'target_name': 'mini_installer',
           'type': 'executable',
           'msvs_guid': '24A5AC7C-280B-4899-9153-6BA570A081E7',
-          'msvs_existing_vcproj': 'mini_installer/mini_installer.vcproj',
           'dependencies': [
             '../chrome.gyp:chrome',
             '../chrome.gyp:chrome_dll',
             '../../testing/gtest.gyp:gtest',
             'setup',
           ],
           'include_dirs': [
             '../..',
             '<(PRODUCT_DIR)',
             '<(INTERMEDIATE_DIR)',
@@ skipping 17 matching lines @@
             'VCLinkerTool': {
               'RandomizedBaseAddress': '1',
               'DataExecutionPrevention': '0',
               'AdditionalDependencies': [
                 '"$(VCInstallDir)crt\\src\\intel\\mt_lib\\memset.obj"',
                 '"$(VCInstallDir)crt\\src\\intel\\mt_lib\\P4_memset.obj"',
                 'shlwapi.lib',
               ],
               'AdditionalLibraryDirectories':
                 ['<(DEPTH)/third_party/platformsdk_win2008_6_1/files/Lib;<(PRODUCT_DIR)/lib'],
-              'AdditionalOptions':
-                '/safeseh:NO /dynamicbase:no /nxcompat /fixed',
               'DelayLoadDLLs=': [],
               'EntryPointSymbol': 'MainEntryPoint',
               'GenerateMapFile': 'true',
               'IgnoreAllDefaultLibraries': 'true',
               'OptimizeForWindows98': '1',
               'SubSystem': '2',     # Set /SUBSYSTEM:WINDOWS
             },
           },
           'configurations': {
             'Debug': {
@@ skipping 258 matching lines @@
       'variables': {
          'branding_dir': '../app/theme/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': '../app/theme/chromium',
       },
     }],
   ],
 }