--- a/python/mozbuild/mozbuild/test/frontend/test_emitter.py
+++ b/python/mozbuild/mozbuild/test/frontend/test_emitter.py
@@ -827,23 +827,16 @@ class TestEmitterBasic(unittest.TestCase
                 'flavor': 'browser-chrome',
                 'installs': {
                     'browser.ini': False,
                     'test_browser.js': True,
                     'support1': False,
                     'support2': False,
                 },
             },
-            'metro.ini': {
-                'flavor': 'metro-chrome',
-                'installs': {
-                    'metro.ini': False,
-                    'test_metro.js': True,
-                },
-            },
             'mochitest.ini': {
                 'flavor': 'mochitest',
                 'installs': {
                     'mochitest.ini': False,
                     'test_mochitest.js': True,
                 },
                 'external': {
                     'external1',

--- a/python/mozbuild/mozbuild/testing.py
+++ b/python/mozbuild/mozbuild/testing.py
@@ -51,17 +51,16 @@ TEST_MANIFESTS = dict(
     CRAMTEST=('cram', 'cram', '.', False),
 
     # marionette tests are run from the srcdir
     # TODO(ato): make packaging work as for other test suites
     MARIONETTE=('marionette', 'marionette', '.', False),
     MARIONETTE_UNIT=('marionette', 'marionette', '.', False),
     MARIONETTE_WEBAPI=('marionette', 'marionette', '.', False),
 
-    METRO_CHROME=('metro-chrome', 'testing/mochitest', 'metro', True),
     MOCHITEST=('mochitest', 'testing/mochitest', 'tests', True),
     MOCHITEST_CHROME=('chrome', 'testing/mochitest', 'chrome', True),
     WEBRTC_SIGNALLING_TEST=('steeplechase', 'steeplechase', '.', True),
     XPCSHELL_TESTS=('xpcshell', 'xpcshell', '.', True),
 )
 
 # Reftests have their own manifest format and are processed separately.
 REFTEST_FLAVORS = ('crashtest', 'reftest')