Switch Android windows builds to also use clang.

Author: a-siva

tools/gn

@@ -99,10 +99,7 @@ def to_gn_args(args):
     gn_args['is_debug'] = args.unoptimized
     gn_args['android_full_debug'] = args.target_os == 'android' and args.unoptimized
     if args.clang is None:
-      # Android gen_snapshot currently isn't buildable with clang on Windows.
-      # For everything else, default to clang.
-      gn_args['is_clang'] = not (sys.platform.startswith(('cygwin', 'win')) and
-                                 args.target_os == 'android')
+      gn_args['is_clang'] = True
     else:
       gn_args['is_clang'] = args.clang