Jonah Williams fd5cbcfe04 Revert "[web] Remove the JS API for url strategy" (flutter/engine#42468)
Reverts flutter/engine#42134

This is blocking the engine into framework roller:

See: https://cirrus-ci.com/task/5610586755563520

```
Analyzing 3 items...                                            
  error • The class 'UrlStrategy' can't be extended outside of its library because it's an interface class • dev/integration_tests/web_e2e_tests/test_driver/url_strategy_integration.dart:48:31 • invalid_use_of_type_outside_library
1 issue found. (ran in 321.8s)
  🙙  🙛  
  ```
2023-06-01 01:53:05 +00:00
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