Bug 1360582 - Move mochitest-media tests to run on 16.04. r=jmaher

MozReview-Commit-ID: 9Kx72HIv3i9

taskcluster/ci/test/tests.yml

@@ -803,6 +803,7 @@ mochitest-media:
     treeherder-symbol: tc-M(mda)
     max-run-time: 5400
     loopback-video: true
+    docker-image: {"in-tree": "desktop1604-test"}
     e10s:
       by-test-platform:
         macosx64/debug: true

taskcluster/taskgraph/transforms/tests.py

@@ -387,18 +387,6 @@ def set_treeherder_machine_platform(config, tests):
         yield test
 
 
-@transforms.add
-def set_asan_docker_image(config, tests):
-    """Set the appropriate task.extra.treeherder.docker-image"""
-    # Linux64-asan has many leaks with running mochitest-media jobs
-    # on Ubuntu 16.04, please remove this when bug 1289209 is resolved
-    for test in tests:
-        if test['suite'] == 'mochitest/mochitest-media' and \
-           test['build-platform'] == 'linux64-asan/opt':
-            test['docker-image'] = {"in-tree": "desktop-test"}
-        yield test
-
-
 @transforms.add
 def set_worker_implementation(config, tests):
     """Set the worker implementation based on the test platform."""