remove COMPILE_ASSERT macro from blink
remove COMPILE_ASSERT macro from blink

All usage of the COMPILE_ASSERT macro in blink have now been converted
to c++'s static_assert.

BUG=442514

Review URL: https://codereview.chromium.org/796303006

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@187564 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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