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I applied modernize-use-override in blink/renderer/platform
http://clang.llvm.org/extra/clang-tidy/checks/modernize-use-override.html

Bug: 428099
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I481f68cd5dfce10e19e938fdee31d4efcadfabef
Reviewed-on: https://chromium-review.googlesource.com/1027230Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553524}