EME: Update tests so 'audioCapabilities' always provided

third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-creation-with-gc.html

Index: third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-creation-with-gc.html
diff --git a/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-creation-with-gc.html b/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-creation-with-gc.html
index 0193d95a9d27686958a0086d325cd3ebc10a57bc..1bea608a70a585099d1854ade98f921372f80d79 100644
--- a/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-creation-with-gc.html
+++ b/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-creation-with-gc.html
@@ -20,7 +20,7 @@
                 getSupportedInitDataType().then(function(type) {
                     initDataType = type;
                     initData = getInitData(initDataType);
-                    return navigator.requestMediaKeySystemAccess('org.w3.clearkey', [{}]);
+                    return requestClearKeySystemAccessForInitType(initDataType);

[ddorwin, 2016/06/21 22:41:00]

Since these tests (in general, not necessarily this one) are intended to test an
API, it seems like a bad idea to abstract away the API call if possible. In
addition, the plan is that the web platform tests will support multiple key
systems (unless the test is explicitly for Clear Key).

I had envisioned a method replacing just the second parameter (`[{}]`). Will
that work? That should also make it easier to replace the keySystem in the WPT
tests and maybe parameterize the config if necessary in some tests.

[jrummell, 2016/06/23 22:04:20]

Done.

                 }).then(function(access) {
                     return access.createMediaKeys();
                 }).then(function(mediaKeys) {