Enable compiling with automatically-downloaded VS toolchain on Windows bots

make.py

Index: make.py
diff --git a/make.py b/make.py
index fc959a05ced5963461d85d001e4f83bd73588787..00a7c6da26c3cdd8314ca7ee5692a090c64ca083 100644
--- a/make.py
+++ b/make.py
@@ -53,48 +53,12 @@ def MakeClean():
     rmtree(OUT_SUBDIR)
 
 
-def CheckWindowsEnvironment():
-    """For Windows: check environment variables needed for command-line build.
-
-    If those environment variables are missing, try to set them.
-    If environment variables can be set up, this function returns; otherwise,
-    it displays an error message and exits.
-    """
-    # If we already have the proper environment variables, nothing to do here.
-    try:
-        env_DevEnvDir = os.environ['DevEnvDir']
-        return  # found it, so we are done
-    except KeyError:
-        pass # go on and run the rest of this function
-
-    print ('\nCould not find Visual Studio environment variables.'
-           '\nPerhaps you have not yet run vcvars32.bat as described at'
-           '\nhttp://msdn.microsoft.com/en-us/library/f2ccy3wt.aspx ?')
-    found_path = None
-    try:
-        possible_path = os.path.abspath(os.path.join(
-            os.environ['VS100COMNTOOLS'], os.path.pardir, os.path.pardir,
-            'VC', 'bin', 'vcvars32.bat'))
-        if os.path.exists(possible_path):
-            found_path = possible_path
-    except KeyError:
-        pass
-    if found_path:
-        print '\nIt looks like you can run that script at:\n%s' % found_path
-    else:
-        print '\nUnable to find vcvars32.bat on your system.'
-    sys.exit(1)
-
-
 def MakeWindows(targets):
     """For Windows: build as appropriate for the command line arguments.
 
     parameters:
         targets: build targets as a list of strings
     """
-    # TODO(epoger): I'm not sure if this is needed for ninja builds.
-    CheckWindowsEnvironment()
-
     # Run gyp_skia to prepare Visual Studio projects.
     cd(SCRIPT_DIR)
     runcommand('python gyp_skia')