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 "ClearHTTPHeaderField").

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

Bug: 937196
Change-Id: I799c50324290a8590d6c7d025b00fe181f613759
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1528129
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Cr-Commit-Position: refs/heads/master@{#642677}
16 files changed