Code:    void CreatePersistentHistogramAllocator() {
    GlobalHistogramAllocator::GetCreateHistogramResultHistogram();
     GlobalHistogramAllocator::CreateWithLocalMemory(
         kAllocatorMemorySize, 0, "HistogramAllocatorTest");
     allocator_ = GlobalHistogramAllocator::Get()->memory_allocator();
  }

Vulnerability Type: Bypass 
CWE ID: CWE-264
Summary: The Extensions subsystem in Google Chrome before 49.0.2623.75 does not properly maintain own properties, which allows remote attackers to bypass intended access restrictions via crafted JavaScript code that triggers an incorrect cast, related to extensions/renderer/v8_helpers.h and gin/converter.h.
Commit Message: Remove UMA.CreatePersistentHistogram.Result

This histogram isn't showing anything meaningful and the problems it
could show are better observed by looking at the allocators directly.

Bug: 831013
Change-Id: Ibe968597758230192e53a7675e7390e968c9e5b9
Reviewed-on: https://chromium-review.googlesource.com/1008047
Commit-Queue: Brian White <bcwhite@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549986}