Do not build mojo/services/test_service in component build.
Do not build mojo/services/test_service in component build.

Mojo applications don't support is_component_build=true.

BUG=497428
TEST=No related warnings in component build.
R=jam@chromium.org

Review URL: https://codereview.chromium.org/1153503011

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#333318}

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