private void removeProvider(String providerName) {
		TreeViewProvider provider = providerMap.remove(providerName);
		if (provider != null) {
			deregisterService(ViewProviderService.class, provider);
		}
	}
Remove the provider with the given name and deregister the service.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/programtree/ProgramTreePlugin.java