Replace COMPILE_ASSERT with static_assert in content/common
Replace COMPILE_ASSERT with static_assert in content/common

All our toolchains support c++'s static_assert now- COMPILE_ASSERT can be removed now.

BUG=442514

Review URL: https://codereview.chromium.org/859803004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#312761}

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