[http] RequestOptions is necessary for params (introduced in 4.0.0-beta.0)

[cexbrayat]

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Current behavior
We can pass options to an HTTP call with http.get(url, {search: searchParams}), but the we can't with the newly introduced params that replaces the deprecated search (#13338 first released in 4.0.0-beta.0).

For params, we have to wrap it in a RequestOptions object: http.get(url, new RequestOptions({params: searchParams})).

Fixed in #14101

Expected behavior
We should be able to pass the options directly without wrapping http.get(url, {params: searchParams}) as we do for the other options.

• Angular version: 4.0.0-beta.4

• Browser: all

• Language: all

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