add missing typehint to RouterController
merged branch Tobion/typhint-routing-profiler (PR #7377)

This PR was submitted for the 2.2 branch but it was merged into the master branch instead (closes #7377).

Commits
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a58a443 [WebProfiler] add missing typehint to RouterController

Discussion
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[WebProfiler] add missing typehint to RouterController

It must be a RouteCollection because TraceableUrlMatcher expects it anyway.

| Q             | A
| ------------- | ---
| Bug fix?      | [no]
| New feature?  | [no]
| BC breaks?    | [no]
| Deprecations? | [no]
| Tests pass?   | [yes]
| License       | MIT