Implement navigator.requestMediaKeySystemAccess()

LayoutTests/media/encrypted-media/encrypted-media-setmediakeys.html

Index: LayoutTests/media/encrypted-media/encrypted-media-setmediakeys.html
diff --git a/LayoutTests/media/encrypted-media/encrypted-media-setmediakeys.html b/LayoutTests/media/encrypted-media/encrypted-media-setmediakeys.html
index 670556b9a8008117ed6ca07bec248ba9bf5d301c..8f87e6a94e3d61931250b668cb9e3d8b8befaae4 100644
--- a/LayoutTests/media/encrypted-media/encrypted-media-setmediakeys.html
+++ b/LayoutTests/media/encrypted-media/encrypted-media-setmediakeys.html
@@ -35,11 +35,13 @@
                     assert_equals(error.name, 'TypeError');
 
                     // Create a MediaKeys object and assign it to video.
-                    return MediaKeys.create('org.w3.clearkey');
+                    return navigator.requestMediaKeySystemAccess('org.w3.clearkey');
+                }).then(function(access) {
+                    assert_equals(access.keySystem, 'org.w3.clearkey');

[ddorwin, 2014/10/24 23:08:14]

nit: Since we're not really testing request() here, we probably don't need
these. WDYT?

Also, line 59

+                    return access.createMediaKeys();
                 }).then(function(result) {
                     mediaKeys = result;
                     assert_not_equals(mediaKeys, null);
-                    assert_equals(mediaKeys.keySystem, 'org.w3.clearkey');
                     return video.setMediaKeys(mediaKeys);
                 }).then(function(result) {
                     assert_not_equals(video.mediaKeys, null);
@@ -52,14 +54,15 @@
                     assert_true(video.mediaKeys === mediaKeys);
 
                     // Create a second MediaKeys.
-                    return MediaKeys.create('org.w3.clearkey');
+                    return navigator.requestMediaKeySystemAccess('org.w3.clearkey');
+                }).then(function(access) {
+                    assert_equals(access.keySystem, 'org.w3.clearkey');
+                    return access.createMediaKeys();
                 }).then(function(result) {
                     mediaKeys2 = result;
                     assert_not_equals(mediaKeys, null);
                     assert_not_equals(mediaKeys2, null);
                     assert_not_equals(mediaKeys, mediaKeys2);
-                    assert_equals(mediaKeys.keySystem, 'org.w3.clearkey');
-                    assert_equals(mediaKeys2.keySystem, 'org.w3.clearkey');
 
                     // Assign the second MediaKeys to video.
                     return video.setMediaKeys(mediaKeys2);