Remove deleted WORKSPACE.go-toolchain from srcs.
Remove deleted WORKSPACE.go-toolchain from srcs.

TESTED: bazel test //src/test/...

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MOS_MIGRATED_REVID=109481372

Xjs/rules_go,bazelbuild/rules_go,Xjs/rules_go,linuxerwang/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,linuxerwang/rules_go,linuxerwang/rules_go,Xjs/rules_go,linuxerwang/rules_go,Xjs/rules_go,bazelbuild/rules_go,Xjs/rules_go,linuxerwang/rules_go