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A recent CL (Blink revision 179922) changed the way JavaScript is run
after resolving a promise (used to run immediately, now run by a
microtask later). encrypted-media-lifetime-mediakeysession-reference.html
started failing as it expected the PromiseResolver object to be around
and counted. Fixing the test as the PromiseResolver object is gone by the
time the JavaScript executes after resolving a promise.

BUG=374772,378245
TEST=failing test passes

Review URL: https://codereview.chromium.org/465833003

git-svn-id: svn://svn.chromium.org/blink/trunk@180121 bbb929c8-8fbe-4397-9dbb-9b2b20218538