Backed out 7 changesets (bug 1661364, bug 1660342) for making bug 1551615 perma fail CLOSED TREE

Backed out changeset a56449ddacc9 (bug 1661364)
Backed out changeset fc185ddca53b (bug 1661364)
Backed out changeset 99234e013005 (bug 1661364)
Backed out changeset eac6bfc4a98d (bug 1661364)
Backed out changeset 9cb0e2dc8d8a (bug 1661364)
Backed out changeset 37b78e402c23 (bug 1661364)
Backed out changeset ae991d4209a7 (bug 1660342)

Author: bogdant-old

docshell/base/BrowsingContextGroup.cpp

@@ -94,7 +94,6 @@ void BrowsingContextGroup::EnsureHostProcess(ContentParent* aProcess) {
 
 void BrowsingContextGroup::RemoveHostProcess(ContentParent* aProcess) {
   MOZ_DIAGNOSTIC_ASSERT(aProcess);
-  MOZ_DIAGNOSTIC_ASSERT(aProcess->GetRemoteType() != PREALLOC_REMOTE_TYPE);
   auto entry = mHosts.Lookup(aProcess->GetRemoteType());
   if (entry && entry.Data() == aProcess) {
     entry.Remove();
@@ -119,7 +118,6 @@ static void CollectContextInitializers(
 void BrowsingContextGroup::Subscribe(ContentParent* aProcess) {
   MOZ_ASSERT(!mDestroyed);
   MOZ_DIAGNOSTIC_ASSERT(aProcess && !aProcess->IsLaunching());
-  MOZ_DIAGNOSTIC_ASSERT(aProcess->GetRemoteType() != PREALLOC_REMOTE_TYPE);
 
   // Check if we're already subscribed to this process.
   if (!mSubscribers.EnsureInserted(aProcess)) {
@@ -166,7 +164,6 @@ void BrowsingContextGroup::Subscribe(ContentParent* aProcess) {
 
 void BrowsingContextGroup::Unsubscribe(ContentParent* aProcess) {
   MOZ_DIAGNOSTIC_ASSERT(aProcess);
-  MOZ_DIAGNOSTIC_ASSERT(aProcess->GetRemoteType() != PREALLOC_REMOTE_TYPE);
   mSubscribers.RemoveEntry(aProcess);
   aProcess->RemoveBrowsingContextGroup(this);