BUrlRequest: fix issues found while documenting

- Remove Pause/Resume functions. They are not possible to implement (the
  server would time out)
- Fix SetContext(NULL) to do the right thing.

Change-Id: I25ba09bb01ea0fe8a85d774611b33be7dc192028
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4245
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Niels Sascha Reedijk <niels.reedijk@gmail.com>

headers/private/netservices/UrlRequest.h

@@ -40,8 +40,6 @@ public:
 
 	// URL protocol thread management
 	virtual	thread_id				Run();
-	virtual status_t				Pause();
-	virtual status_t				Resume();
 	virtual	status_t				Stop();
 	virtual void					SetTimeout(bigtime_t timeout) {}
 

src/kits/network/libnetservices/UrlRequest.cpp

@@ -98,22 +98,6 @@ BUrlRequest::Run()
 }
 
 
-status_t
-BUrlRequest::Pause()
-{
-	// TODO
-	return B_ERROR;
-}
-
-
-status_t
-BUrlRequest::Resume()
-{
-	// TODO
-	return B_ERROR;
-}
-
-
 status_t
 BUrlRequest::Stop()
 {
@@ -146,7 +130,11 @@ BUrlRequest::SetContext(BUrlContext* context)
 	if (IsRunning())
 		return B_ERROR;
 
-	fContext = context;
+	if (context == NULL)
+		fContext = gDefaultContext;
+	else
+		fContext = context;
+
 	return B_OK;
 }