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This CL add in some extra condition in updating scopes_route_cache_.
A node should not be considered as an scoped routes node if it does not
has any children that is a named routes node. This will solved the
problem of not triggering edge transitions when scoped routes node is
unchanged but its children come and go.

Test: build cast_shell and unittest
Bug: b/171499941, b/168548001
Change-Id: I3b48179762871d8d9faa5df9afff0a2ac3c935c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495913
Commit-Queue: Yuanyao Zhong <yyzhong@google.com>
Reviewed-by: Randy Rossi <rmrossi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821224}