Roll chromium_revision a253a1bb31..49f56a2e7b (436254:436268)
Roll chromium_revision a253a1bb31..49f56a2e7b (436254:436268)

Change log: https://chromium.googlesource.com/chromium/src/+log/a253a1bb31..49f56a2e7b
Full diff: https://chromium.googlesource.com/chromium/src/+/a253a1bb31..49f56a2e7b

No dependencies changed.
No update to Clang.

TBR=
BUG=None

Review-Url: https://codereview.webrtc.org/2548273003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#15419}

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