line_chart_v2: fix build deps to line_chart_v2
line_chart_v2: fix build deps to line_chart_v2

This change adds two missing deps (strict_deps violation) in the
line_chart_v2.

Test Plan:
Test sync in progress…

wchargin-branch: line-chart-v2-build-deps-20201123
wchargin-source: ac993ff5d91578f33c2ac498afb10a92da813303

tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard