Roll chromium_revision bb6532a981..66cbc51065 (476902:476905)
Roll chromium_revision bb6532a981..66cbc51065 (476902:476905)

Change log: https://chromium.googlesource.com/chromium/src/+log/bb6532a981..66cbc51065
Full diff: https://chromium.googlesource.com/chromium/src/+/bb6532a981..66cbc51065

Changed dependencies:
* src/testing: https://chromium.googlesource.com/chromium/src/testing/+log/ccf0efafb1..a0b84c9d55
DEPS diff: https://chromium.googlesource.com/chromium/src/+/bb6532a981..66cbc51065/DEPS

No update to Clang.

TBR=
BUG=None

Review-Url: https://codereview.webrtc.org/2922853002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#18431}

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