Blink loader: Reduce the size of resource_request.h

Remove dependency to encoded_form_data.h and security_origin.h.

resource_request.h is used in 4,400+ compilation units, and this CL
reduces its estimated expanded size by 0.24MB.

Bug: 242216
Change-Id: Ief70b318e39c508b75791db3d708ed7cee40c277
Reviewed-on: https://chromium-review.googlesource.com/1107030
Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568734}
10 files changed