The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/44e2e5f8caf153b0ad01425665ec17bbc419a76b

commit 44e2e5f8caf153b0ad01425665ec17bbc419a76b
Author: Thanh Le <thanhdle@chromium.org>
Date: Tue Dec 05 18:18:15 2017

Clear log messages and buffer on chrome://interventions when history is cleared.

Logs messages of navigation are retained in PreviewsLogger bufffer, and
on chrome://interventions-internals until the end of that session even
when user history is cleared.

Since ClearBlacklist event is triggered whenever history is cleared,
removing all log message on the page, and all buffer messages in
PreviewsLogger seems like a reasonable solution.

Bug:  791774 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I0f69f5ec89679826557cdd23bbd1f316957711ec
Reviewed-on: https://chromium-review.googlesource.com/807397
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Thanh Le <thanhdle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521747}
[modify] https://crrev.com/44e2e5f8caf153b0ad01425665ec17bbc419a76b/chrome/browser/resources/interventions_internals/index.js
[modify] https://crrev.com/44e2e5f8caf153b0ad01425665ec17bbc419a76b/chrome/test/data/webui/interventions_internals_browsertest.js
[modify] https://crrev.com/44e2e5f8caf153b0ad01425665ec17bbc419a76b/components/previews/core/previews_logger.cc
[modify] https://crrev.com/44e2e5f8caf153b0ad01425665ec17bbc419a76b/components/previews/core/previews_logger_unittest.cc

Hey Ryan, could you merge the CL in comment #1 to 64. Thanks!

Requesting merge, as there is a concern here that this can expose part of user's recent history after clearing their browsing history.

Approving merge to M64 Chrome OS.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f346ef69d5eec846794d8d20f94372f3bc41a0fa

commit f346ef69d5eec846794d8d20f94372f3bc41a0fa
Author: Thanh Le <thanhdle@chromium.org>
Date: Wed Dec 06 18:27:50 2017

Clear log messages and buffer on chrome://interventions when history is cleared.

Logs messages of navigation are retained in PreviewsLogger bufffer, and
on chrome://interventions-internals until the end of that session even
when user history is cleared.

Since ClearBlacklist event is triggered whenever history is cleared,
removing all log message on the page, and all buffer messages in
PreviewsLogger seems like a reasonable solution.

Bug:  791774 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I0f69f5ec89679826557cdd23bbd1f316957711ec
Reviewed-on: https://chromium-review.googlesource.com/807397
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Thanh Le <thanhdle@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#521747}(cherry picked from commit 44e2e5f8caf153b0ad01425665ec17bbc419a76b)
Reviewed-on: https://chromium-review.googlesource.com/811605
Cr-Commit-Position: refs/branch-heads/3282@{#60}
Cr-Branched-From: 5fdc0fab22ce7efd32532ee989b223fa12f8171e-refs/heads/master@{#520840}
[modify] https://crrev.com/f346ef69d5eec846794d8d20f94372f3bc41a0fa/chrome/browser/resources/interventions_internals/index.js
[modify] https://crrev.com/f346ef69d5eec846794d8d20f94372f3bc41a0fa/chrome/test/data/webui/interventions_internals_browsertest.js
[modify] https://crrev.com/f346ef69d5eec846794d8d20f94372f3bc41a0fa/components/previews/core/previews_logger.cc
[modify] https://crrev.com/f346ef69d5eec846794d8d20f94372f3bc41a0fa/components/previews/core/previews_logger_unittest.cc