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Simply moves RequestParams to its own file. This is a pure
refactoring change.

BUG=974391

Change-Id: Id02ae3f33847617ea65ad2e5d757094015d22bd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881494
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Auto-Submit: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Kelvin Jiang <kelvinjiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710129}