Fix build regression on Linux Chromium's Linux toolchain doesn't implement the return value of std::vector::insert correctly, causing a build failure. Remove an unnecessary assignment of the return value to fix this build regression. The regression was caused by the commit: "Put each array declarator into a separate declaration in HLSL output" TEST=angle_unittests Change-Id: I2959122d28e4c7e6d6a4d842a97a8f1fd4f27ca1 Reviewed-on: https://chromium-review.googlesource.com/266990 Reviewed-by: Olli Etuaho <oetuaho@nvidia.com> Tested-by: Olli Etuaho <oetuaho@nvidia.com>