Implement navigator.requestMediaKeySystemAccess()

LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeys-with-session.html

Index: LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeys-with-session.html
diff --git a/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeys-with-session.html b/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeys-with-session.html
index ca033b6518dd10eb3e2479c42a59a82f081aa691..6ab4bb750278a08e25315d23933c23ff59bee585 100644
--- a/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeys-with-session.html
+++ b/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeys-with-session.html
@@ -35,7 +35,10 @@
                 }
 
                 // Create a MediaKeys object with a session.
-                MediaKeys.create('org.w3.clearkey').then(function(result) {
+                navigator.requestMediaKeySystemAccess('org.w3.clearkey').then(function(access) {
+                    assert_equals(access.keySystem, 'org.w3.clearkey');
+                    return access.createMediaKeys();
+                }).then(function(result) {
                     mediaKeys = result;
 
                     // Verify MediaKeys are not an ActiveDOMObject.
@@ -52,7 +55,7 @@
                     // session since we still have a reference to it.
                     return createGCPromise();
                 }).then(function(result) {
-                    assert_equals(mediaKeys.keySystem, 'org.w3.clearkey');
+                    assert_equals(typeof mediaKeys.createSession, 'function');
                     // Ensure that MediaKeySession (but not PromiseResolver) is
                     // still around.
                     assert_equals(numActiveDOMObjectsCreated(), 1, 'After gc()');