Revert of Change default Windows compiler to VS 2015

build/vs_toolchain.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 import json
 import os
 import pipes
 import shutil
 import subprocess
 import sys
 
 
 script_dir = os.path.dirname(os.path.realpath(__file__))
 chrome_src = os.path.abspath(os.path.join(script_dir, os.pardir))
 SRC_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 sys.path.insert(0, os.path.join(chrome_src, 'tools', 'gyp', 'pylib'))
 json_data_file = os.path.join(script_dir, 'win_toolchain.json')
 
 
 import gyp
 
 
-# Use MSVS2015 as the default toolchain.
-CURRENT_DEFAULT_TOOLCHAIN_VERSION = '2015'
+# Use MSVS2013 as the default toolchain.
+CURRENT_DEFAULT_TOOLCHAIN_VERSION = '2013'
 
 
 def SetEnvironmentAndGetRuntimeDllDirs():
   """Sets up os.environ to use the depot_tools VS toolchain with gyp, and
   returns the location of the VS runtime DLLs so they can be copied into
   the output directory after gyp generation.
   """
   vs_runtime_dll_dirs = None
   depot_tools_win_toolchain = \
       bool(int(os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN', '1')))
@@ skipping 231 matching lines @@
     _CopyRuntime(target_dir, runtime_dir, target_cpu, debug=True)
 
 
 def _GetDesiredVsToolchainHashes():
   """Load a list of SHA1s corresponding to the toolchains that we want installed
   to build with."""
   if GetVisualStudioVersion() == '2015':
     # Update 1 with Debuggers, UCRT installers and ucrtbased.dll
     return ['523b6c2d3df300b2c8538cdc0beac404726af051']
   else:
+    # Default to VS2013.
     return ['4087e065abebdca6dbd0caca2910c6718d2ec67f']
 
 
 def ShouldUpdateToolchain():
   """Check if the toolchain should be upgraded."""
   if not os.path.exists(json_data_file):
     return True
   with open(json_data_file, 'r') as tempf:
     toolchain_data = json.load(tempf)
   version = toolchain_data['version']
@@ skipping 13 matching lines @@
     return 1
   if force == '--force' or os.path.exists(json_data_file):
     force = True
 
   depot_tools_win_toolchain = \
       bool(int(os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN', '1')))
   if ((sys.platform in ('win32', 'cygwin') or force) and
         depot_tools_win_toolchain):
     import find_depot_tools
     depot_tools_path = find_depot_tools.add_depot_tools_to_path()
-    # Necessary so that get_toolchain_if_necessary.py will put the VS toolkit
-    # in the correct directory.
-    os.environ['GYP_MSVS_VERSION'] = GetVisualStudioVersion()
     get_toolchain_args = [
         sys.executable,
         os.path.join(depot_tools_path,
                     'win_toolchain',
                     'get_toolchain_if_necessary.py'),
         '--output-json', json_data_file,
       ] + _GetDesiredVsToolchainHashes()
     if force:
       get_toolchain_args.append('--force')
     subprocess.check_call(get_toolchain_args)
@@ skipping 32 matching lines @@
       'copy_dlls': CopyDlls,
   }
   if len(sys.argv) < 2 or sys.argv[1] not in commands:
     print >>sys.stderr, 'Expected one of: %s' % ', '.join(commands)
     return 1
   return commands[sys.argv[1]](*sys.argv[2:])
 
 
 if __name__ == '__main__':
   sys.exit(main())