Remove all @deprecated code from core include components.

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Line bootstrap.inc
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403 Call to deprecated constant REQUEST_TIME: Deprecated in drupal:8.3.0 and is removed from drupal:9.0.0. Use
\Drupal::time()->getRequestTime();
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Line common.inc
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594 Call to deprecated constant REQUEST_TIME: Deprecated in drupal:8.3.0 and is removed from drupal:9.0.0. Use
\Drupal::time()->getRequestTime();
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Line install.core.inc
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1061 Call to deprecated constant REQUEST_TIME: Deprecated in drupal:8.3.0 and is removed from drupal:9.0.0. Use
\Drupal::time()->getRequestTime();
1063 Call to deprecated constant REQUEST_TIME: Deprecated in drupal:8.3.0 and is removed from drupal:9.0.0. Use
\Drupal::time()->getRequestTime();
------ ------------------------------------------------------------------------------------------------------------

[ERROR] Found 4 errors