Roll chromium_revision 2a70cb1..4662d4f (367468:368042)
Roll chromium_revision 2a70cb1..4662d4f (367468:368042)

I had to fix the audio_device BUILD.gn which was forgotten back
in https://codereview.webrtc.org/1536923003. It also contained a few
missing source files and one library.

Change log: https://chromium.googlesource.com/chromium/src/+log/2a70cb1..4662d4f
Full diff: https://chromium.googlesource.com/chromium/src/+/2a70cb1..4662d4f

Changed dependencies:
* src/buildtools: https://chromium.googlesource.com/chromium/buildtools.git/+log/6d0c448..0f8e6e4
* src/third_party/libsrtp: https://chromium.googlesource.com/chromium/deps/libsrtp.git/+log/8a7662a..ebfcc9a
DEPS diff: https://chromium.googlesource.com/chromium/src/+/2a70cb1..4662d4f/DEPS

No update to Clang.

TBR=henrika@webrtc.org
NOTRY=True

Review URL: https://codereview.webrtc.org/1565093002

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#11162}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: a46a4c92d0c74fab0028170d0746e2670160aefd

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