Remove extra semicolon from frame_messages.h.
Remove extra semicolon from frame_messages.h.

This fixes an IPC fuzzer build breakage.

R=inferno@chromium.org,alexmos@chromium.org

Review URL: https://codereview.chromium.org/1133613003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#328790}

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