Roll chromium_revision 47f5ca5642..5cda18fb97 (479659:479679)
Roll chromium_revision 47f5ca5642..5cda18fb97 (479659:479679)

Change log: https://chromium.googlesource.com/chromium/src/+log/47f5ca5642..5cda18fb97
Full diff: https://chromium.googlesource.com/chromium/src/+/47f5ca5642..5cda18fb97

Changed dependencies:
* src/testing: https://chromium.googlesource.com/chromium/src/testing/+log/4f3319b4e6..f68279d633
* src/third_party: https://chromium.googlesource.com/chromium/src/third_party/+log/b6191cc560..612558a7a0
* src/tools: https://chromium.googlesource.com/chromium/src/tools/+log/85ec479bb3..16f5664a2e
DEPS diff: https://chromium.googlesource.com/chromium/src/+/47f5ca5642..5cda18fb97/DEPS

No update to Clang.

TBR=
BUG=None

Review-Url: https://codereview.webrtc.org/2935353003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#18612}

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