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..293a45081fd81bff987c9022b08343c200473b71 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) {

[ddorwin, 2016/06/24 03:05:22]

We don't actually need this. If we ask for all types in the
requestMediaKeySystemAccess() call below, we'll get a list of the supported ones
back in |access|. We can then grab access.initDataTypes[0] at line 25.

This pattern could be used to support all user agents, except for key system
variants, which may require a similar model.

What does that mean here? Well, we don't need this call, though someone might
want to replace it with getSupportedKeySystem(). Line 23 doesn't need take the
IDT and could simply be getSimpleConfigurationWithInitDataType(), which would be
different from getMinimalConfiguration(), though I'm not sure that matters - we
might just have getSimpleConfiguration().

Note: The IDTs are independent of the content types. See the note in
https://w3c.github.io/encrypted-media/#get-supported-configuration-and-consent.

[jrummell, 2016/06/28 23:04:26]

Done.

                     initDataType = type;
                     initData = getInitData(initDataType);
-                    return navigator.requestMediaKeySystemAccess('org.w3.clearkey', [{}]);
+                    return navigator.requestMediaKeySystemAccess('org.w3.clearkey', simpleConfigurationForInitDataType(initDataType));
                 }).then(function(access) {
                     return access.createMediaKeys();
                 }).then(function(mediaKeys) {