Remove unused ALLOCATE_DELAY constant.
Remove unused ALLOCATE_DELAY constant.

Breaks linux_tsan2 compile [-Wunused-const-variable].

TBR=mallinath@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/20749004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 83785d37d119fc323abe41609052edc149c74197

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