Fix string resource for register protocol handler.
Fix string resource for register protocol handler.

The string resource had a replacement placeholder that was unable to
be replaced.

BUG=601695

Review URL: https://codereview.chromium.org/1893273002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#388115}

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