Code:    SubprocessMetricsProviderTest()
       : thread_bundle_(content::TestBrowserThreadBundle::DEFAULT) {
    base::PersistentHistogramAllocator::GetCreateHistogramResultHistogram();
    provider_.MergeHistogramDeltas();

    test_recorder_ = base::StatisticsRecorder::CreateTemporaryForTesting();

    base::GlobalHistogramAllocator::CreateWithLocalMemory(TEST_MEMORY_SIZE,
                                                          0, "");
  }

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}
CWE ID: CWE-264
   SubprocessMetricsProviderTest()
       : thread_bundle_(content::TestBrowserThreadBundle::DEFAULT) {
    provider_.MergeHistogramDeltas();

    test_recorder_ = base::StatisticsRecorder::CreateTemporaryForTesting();

    base::GlobalHistogramAllocator::CreateWithLocalMemory(TEST_MEMORY_SIZE,
                                                          0, "");
  }
