Make case style consistent in resource_response.h

The primary motivation of CL is that the function names aren't
consistent within resource_response.h
(e.g."HttpHeaderField" and "SetHTTPHeaderField").

This CL renames function |SetHTTPHeaderField| to |SetHttpHeaderField|
and ports other dependent files to refer to a new function name.

Bug: 937196
Change-Id: I15e380cb1f9dfb4bfc769225a9e2fea1640d0d97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1527953
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643291}
44 files changed