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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4909ec849b19c4a89caa4413e3e7cb9de9a8fab2

commit 4909ec849b19c4a89caa4413e3e7cb9de9a8fab2
Author: Alexandr Ilin <alexilin@chromium.org>
Date: Wed Jun 06 10:22:48 2018

predictors: Update the NetBenchmarking to clear the LoadingPredictor DB

NetBenchmarking provides a method to clear network predictor cache. The
predictor is migrating to a different service, so this method should
clear a different DB.

This CL also removes unsafe storing a Profile* on the IO thread. The
NetBenchmarking stores weak pointers to predictors instead.

Bug:  838949 ,  623967 
Change-Id: Ie73d57555237aea4ebb7be1a324151e5ea190b68
Reviewed-on: https://chromium-review.googlesource.com/1085450
Commit-Queue: Alexandr Ilin <alexilin@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564846}
[modify] https://crrev.com/4909ec849b19c4a89caa4413e3e7cb9de9a8fab2/chrome/browser/chrome_content_browser_client.cc
[modify] https://crrev.com/4909ec849b19c4a89caa4413e3e7cb9de9a8fab2/chrome/browser/net/predictor.h
[modify] https://crrev.com/4909ec849b19c4a89caa4413e3e7cb9de9a8fab2/chrome/browser/net_benchmarking.cc
[modify] https://crrev.com/4909ec849b19c4a89caa4413e3e7cb9de9a8fab2/chrome/browser/net_benchmarking.h
[modify] https://crrev.com/4909ec849b19c4a89caa4413e3e7cb9de9a8fab2/chrome/browser/predictors/resource_prefetch_predictor.cc
[modify] https://crrev.com/4909ec849b19c4a89caa4413e3e7cb9de9a8fab2/chrome/browser/predictors/resource_prefetch_predictor.h
[modify] https://crrev.com/4909ec849b19c4a89caa4413e3e7cb9de9a8fab2/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc