Roll chromium_revision 999a40e458..8e89b0b1a1 (478482:478506)
Roll chromium_revision 999a40e458..8e89b0b1a1 (478482:478506)

Change log: https://chromium.googlesource.com/chromium/src/+log/999a40e458..8e89b0b1a1
Full diff: https://chromium.googlesource.com/chromium/src/+/999a40e458..8e89b0b1a1

Changed dependencies:
* src/testing: https://chromium.googlesource.com/chromium/src/testing/+log/94a899c443..9c7fe7afca
* src/third_party: https://chromium.googlesource.com/chromium/src/third_party/+log/cdc20cc13d..d466a5cca3
* src/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult.git/+log/4ef4b9509f..36e1cdaf2d
* src/tools: https://chromium.googlesource.com/chromium/src/tools/+log/1818b91d9b..8ca412b1f1
DEPS diff: https://chromium.googlesource.com/chromium/src/+/999a40e458..8e89b0b1a1/DEPS

No update to Clang.

TBR=
BUG=None

Review-Url: https://codereview.webrtc.org/2932203002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#18522}

TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc