The DecodeWasmFunctionOffsets method was used for debugging, but is not
needed any more. The FindSection function was only used in
DecodeWasmFunctionOffsets. This CL removes both.

R=ahaas@chromium.org

Change-Id: Id4aa05419298ff271766676ec8453134c6e98a69
Reviewed-on: https://chromium-review.googlesource.com/457316Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43932}