Revert "In older STLs, std::vector::insert() returns void."

This reverts commit 7dd8ee9c6091fe51c9d337c06d6243731a0aafb3.

Reason for revert: going to revert primary CL

Original change's description:
> In older STLs, std::vector::insert() returns void.
> 
> CQ_INCLUDE_TRYBOTS=skia.primary:Build-Debian9-Clang-arm-Debug-Chromebook_GLES
> 
> Change-Id: I7bd15ecc7122965db16fbb51e51ee166b05dce2f
> Reviewed-on: https://skia-review.googlesource.com/117722
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Mike Klein <mtklein@chromium.org>

TBR=mtklein@chromium.org,brianosman@google.com

Change-Id: I9c126edbef74293d8e7a2b7e2365e464ba367ae5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Cq-Include-Trybots: skia.primary:Build-Debian9-Clang-arm-Debug-Chromebook_GLES
Reviewed-on: https://skia-review.googlesource.com/117900
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed