Avoid incrementing an invalid iterator in the utility process client.
Avoid incrementing an invalid iterator in the utility process client.

BUG=597124

Review-Url: https://codereview.chromium.org/1951213002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#392496}

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