EME: Update tests so 'audioCapabilities' always provided

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

Index: third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-setcert-with-gc.html
diff --git a/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-setcert-with-gc.html b/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-setcert-with-gc.html
index 98e66e7a5c683d72368587343d6166906bed1801..68111018819e3b1bb4ca8fd017681279a034702b 100644
--- a/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-setcert-with-gc.html
+++ b/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-async-setcert-with-gc.html
@@ -14,7 +14,9 @@
 
             promise_test(function(test)
             {
-                return navigator.requestMediaKeySystemAccess('org.w3.clearkey', [{}]).then(function(access) {
+                return getSupportedInitDataType().then(function(initDataType) {
+                    return navigator.requestMediaKeySystemAccess('org.w3.clearkey', simpleConfigurationForInitDataType(initDataType));

[ddorwin, 2016/06/23 22:52:38]

As discussed, if we're not actually using initData in a test, we don't need to
include it in the configuration. That allows us to keep this simple like it was
before.

If these tests are to be used for spec tests where not all user agents support
WebM and/or Vorbis (your chosen simple configuration), such a promise-based
mechanism will be necessary (see also my comments in the .js file.). However,
since this is pretty isolated and does not address that, I think we should keep
it simple.

I think we should just call simpleConfiguration() her and the few other files
that don't need initDataType and aren't already WebM-specific.

[jrummell, 2016/06/24 00:12:29]

Done.

+                }).then(function(access) {
                     return access.createMediaKeys();
                 }).then(function(mediaKeys) {
                     var cert = new Uint8Array(200);