Protocol definitions in frontend now require imports

[Tim Van der Lippe]

Hey all,

In https://crrev.com/c/2897519 we have removed the global Protocol types from every single `ts_library` target. If you want to refer to a CDP type, you should now import the relevant types directly:

For `Protocol.` types, import from `front_end/generated/protocol.js`.

For `ProtocolProxyApi.` types, import from `front_end/generated/protocol-proxy-api.js`.

For additional examples, please see the prior CLs that have landed, such as https://crrev.com/c/2897294

Let me know if you have any questions.

Cheers,

Tim