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This is a functional revert of https://codereview.chromium.org/192693002.

Per `git log -S CreateFunctionHandler`, this API was never used, and was
only part of refactoring:
https://codereview.chromium.org/671433004
https://chromium-review.googlesource.com/760376

Change-Id: Ibcbad96a7f145dbf14e87e70a59318802971ba3f
Reviewed-on: https://chromium-review.googlesource.com/886442Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532188}