cmd/go/internal/str,cmd/go/internal/work: remove redundant Contains

[apocelipes]

"cmd/go/internal/str.Contains" does the same thing as the "slices.Contains".

The name "str.Contains" is also easily confused with "strings.Contains".

Given that the slices package is already used in the package,
replace "str.Contains" with "slices.Contains".

"str.Contains" is no longer used so just remove it.

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Patch Set 1:

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Patch Set 1:

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Patch Set 1: Code-Review+1

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Patch Set 2:

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Patch Set 3:

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Patch Set 3: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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Patch Set 3:

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Patch Set 3: -Commit-Queue

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This PR is being closed because golang.org/cl/542416 has been merged.