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returned an invalid value.

Spotted a bug, that kNotSetRendererId value was treated as valid in
Objective-C part.

Bug: 1075444
Change-Id: Id81c7057075ca4388952248d3f480b504817f1dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2238166Reviewed-by: Vadym Doroshenko  <dvadym@chromium.org>
Commit-Queue: Maria Kazinova <kazinova@google.com>
Cr-Commit-Position: refs/heads/master@{#776869}