EME: Allow temporary sessions to be removed for ClearKey only.

third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp

Index: third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
diff --git a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
index 02128d9c900173584204fb5ef5453db69c960db1..7036d51910f88ae8e91d07aa26ef0a1fbba05537 100644
--- a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
+++ b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.cpp
@@ -813,37 +813,27 @@ ScriptPromise MediaKeySession::remove(ScriptState* script_state) {
   if (!is_callable_)
     return CreateRejectedPromiseNotCallable(script_state);
 
-  // 3. If the result of running the "Is persistent session type?" algorithm
-  //    on this object's session type is false, return a promise rejected
-  //    with a newly created TypeError.
-  if (!IsPersistentSessionType(session_type_)) {
-    return ScriptPromise::Reject(
-        script_state,
-        V8ThrowException::CreateTypeError(
-            script_state->GetIsolate(), "The session type is not persistent."));
-  }
-
-  // 4. Let promise be a new promise.
+  // 3. Let promise be a new promise.
   SimpleResultPromise* result = new SimpleResultPromise(script_state, this);
   ScriptPromise promise = result->Promise();
 
-  // 5. Run the following steps asynchronously (done in removeTask()).
+  // 4. Run the following steps asynchronously (done in removeTask()).
   pending_actions_.push_back(PendingAction::CreatePendingRemove(result));
   if (!action_timer_.IsActive())
     action_timer_.StartOneShot(0, BLINK_FROM_HERE);
 
-  // 6. Return promise.
+  // 5. Return promise.
   return promise;
 }
 
 void MediaKeySession::RemoveTask(ContentDecryptionModuleResult* result) {
-  // NOTE: Continue step 5 of MediaKeySession::remove().
+  // NOTE: Continue step 4 of MediaKeySession::remove().
   DVLOG(MEDIA_KEY_SESSION_LOG_LEVEL) << __func__ << "(" << this << ")";
 
-  // remove() in Chromium will execute steps 5.1 through 5.3.
+  // remove() in Chromium will execute steps 4.1 through 4.5.
   session_->Remove(result->Result());
 
-  // Last step (5.3.6 Resolve promise) will be done when |result| is resolved.
+  // Last step (4.5.6 Resolve promise) will be done when |result| is resolved.
 }
 
 void MediaKeySession::ActionTimerFired(TimerBase*) {