Let ninja/mac pass all gyp tests.

test/dependencies/gyptest-lib-only.py

 #!/usr/bin/env python
 
 # Copyright (c) 2011 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Verify that a link time only dependency will get pulled into the set of built
 targets, even if no executable uses it.
 """
@@ skipping 11 matching lines @@
 test.built_file_must_exist('a', type=test.STATIC_LIB)
 
 # TODO(bradnelson/mark):
 # On linux and windows a library target will at least pull its link dependencies
 # into the generated sln/_main.scons, since not doing so confuses users.
 # This is not currently implemented on mac, which has the opposite behavior.
 if sys.platform == 'darwin':
   if test.format == 'xcode':
     test.built_file_must_not_exist('b', type=test.STATIC_LIB)
   else:
-    assert test.format == 'make'
+    assert test.format in ('make', 'ninja')
     test.built_file_must_exist('b', type=test.STATIC_LIB)
 else:
   # Make puts the resulting library in a directory matching the input gyp file;
   # for the 'b' library, that is in the 'b' subdirectory.
   test.built_file_must_exist('b', type=test.STATIC_LIB, subdir='b')
 
 test.pass_test()