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operator new(size_t size, void* buffer, sandbox::AllocationType type) just
returns buffer, which is what the default placement new operator does too.

No intended behavior change.

(The motivation is to get rid of the two "return NULL"s in
`operator delete(void* memory, sandbox::AllocationType type)`, as they are
undefined behavior.)

BUG=none

Review URL: https://codereview.chromium.org/544333002

Cr-Commit-Position: refs/heads/master@{#294119}