Resume blocked requests if no active session can resume anymore

Author: juliandescottes

index.bs

@@ -1657,6 +1657,11 @@ To <dfn>cleanup the session</dfn> given |session|:
    1. [=map/Remove=] |session|'s
       [=user context to proxy configuration map=][|user context|].
 
+1. For each |request id| in |session|'s [=blocked request map=]:
+
+   1. [=Resume=] with "<code>continue request</code>", |request id|
+      and (null, "<code>incomplete</code>").
+
 1. For each |collector| in |session|'s [=network collectors=]:
 
    1. Let |collector id| be |collector|'s <code>collector</code>.