network_time: Fix dependency errors reported by 'gn check' tool.
network_time: Fix dependency errors reported by 'gn check' tool.

Tested on Linux with the following command lines:

$ gn gen out-gn/Release --args='is_debug=false is_component_build=false symbol_level=1'
$ gn check out-gn/Release //components/network_time/*

BUG=367595, 376000
TEST=see above
R=zea@chromium.org

Review URL: https://codereview.chromium.org/1411333005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#356377}

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