Fix AppRTC Android Demo GN build when is_component_build=true.
Fix AppRTC Android Demo GN build when is_component_build=true.

BUG=webrtc:6174
NOTRY=True

Review-Url: https://codereview.webrtc.org/2270003002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#13876}

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