Move GlobalHistogramAllocator creation into multi-init-safe region.
Move GlobalHistogramAllocator creation into multi-init-safe region.

BUG=612137
TBR=nick
no logic changes, just moved downward a block of code

Review-Url: https://codereview.chromium.org/1994953002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#394764}

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