Bug 1359976: remove references to now-unused test-platform-phylum; r=wcosta

MozReview-Commit-ID: A86tEB4nbIx

--HG--
extra : rebase_source : 56f69a946970e5c8c37b4aea1374e4ac31b48600

taskcluster/taskgraph/transforms/tests.py

@@ -166,7 +166,7 @@ test_description_schema = Schema({
     # in-tree, then a dependency will be created automatically.  This is
     # generally `desktop-test`, or an image that acts an awful lot like it.
     Required('docker-image', default={'in-tree': 'desktop-test'}): optionally_keyed_by(
-        'test-platform', 'test-platform-phylum',
+        'test-platform',
         Any(
             # a raw Docker image path (repo/image:tag)
             basestring,
@@ -193,7 +193,7 @@ test_description_schema = Schema({
 
     # What to run
     Required('mozharness'): optionally_keyed_by(
-        'test-platform', 'test-platform-phylum', {
+        'test-platform', {
             # the mozharness script used to run this task
             Required('script'): basestring,