Findit identified the culprit r580980 with confidence 70.0% in the config "chromium.win / Win10 Tests x64"
based on the flakiness trend:

https://findit-for-me.appspot.com/waterfall/flake?key=ag9zfmZpbmRpdC1mb3ItbWVyqwELEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCJ1Y2hyb21pdW0ud2luL1dpbjEwIFRlc3RzIHg2NC8yNjMwMS9uZXR3b3JrX3NlcnZpY2VfYnJvd3Nlcl90ZXN0cyBvbiBXaW5kb3dzLTEwLTE1MDYzL1UyVjBTV052YmtGUVNWUmxjM1F1VDNabGNuWnBaWGM9DAsSE01hc3RlckZsYWtlQW5hbHlzaXMYAQw

If the culprit above is wrong, please file a bug using this link and hit submit:
https://bugs.chromium.org/p/chromium/issues/entry?status=Unconfirmed&labels=Pri-1,Test-Findit-Wrong&components=Tools%3ETest%3EFindit%3EFlakiness&summary=%5BFindit%5D%20Flake%20Analyzer%20-%20Wrong%20result%20for%20SetIconAPITest.Overview&comment=Link%20to%20Analysis%3A%20https://findit-for-me.appspot.com/waterfall/flake?key=ag9zfmZpbmRpdC1mb3ItbWVyqwELEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCJ1Y2hyb21pdW0ud2luL1dpbjEwIFRlc3RzIHg2NC8yNjMwMS9uZXR3b3JrX3NlcnZpY2VfYnJvd3Nlcl90ZXN0cyBvbiBXaW5kb3dzLTEwLTE1MDYzL1UyVjBTV052YmtGUVNWUmxjM1F1VDNabGNuWnBaWGM9DAsSE01hc3RlckZsYWtlQW5hbHlzaXMYAQw

Automatically posted by the findit-for-me app (https://goo.gl/Ot9f7N).

https://chromium-review.googlesource.com/c/chromium/src/+/1165122

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1c472ffdfc0d6ba628f08e08c4558246f98c6bd3

commit 1c472ffdfc0d6ba628f08e08c4558246f98c6bd3
Author: Rune Lillesveen <futhark@chromium.org>
Date: Tue Aug 07 11:26:06 2018

Revert "Fix flaky webrequest related network service tests in component builds"

This reverts commit 30d8a3b9d66558f01b026c11ffe7db2bbda6fc1e.

Reason for revert: Made SetIconAPITest.Overview test flaky (871720)

Original change's description:
> Fix flaky webrequest related network service tests in component builds
> 
> These tests needed some extra synchronization due to the changes made in
> http://crrev.com/c/1139048. These were flaking in component builds.
> 
> Bug:  871224 
> Change-Id: Ibe370f9b9c8ebb94ee1dd21ba204c06e91518057
> Reviewed-on: https://chromium-review.googlesource.com/1163987
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#580980}

TBR=jam@chromium.org,cduvall@chromium.org

Change-Id: If7bb80ef219f5aa5107ffd012981839dfaceac76
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  871224 ,  871720 
Reviewed-on: https://chromium-review.googlesource.com/1165122
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581195}
[modify] https://crrev.com/1c472ffdfc0d6ba628f08e08c4558246f98c6bd3/chrome/browser/extensions/api/declarative/declarative_apitest.cc
[modify] https://crrev.com/1c472ffdfc0d6ba628f08e08c4558246f98c6bd3/chrome/browser/extensions/api/declarative_content/declarative_content_apitest.cc
[modify] https://crrev.com/1c472ffdfc0d6ba628f08e08c4558246f98c6bd3/chrome/browser/extensions/api/declarative_content/set_icon_apitest.cc
[modify] https://crrev.com/1c472ffdfc0d6ba628f08e08c4558246f98c6bd3/chrome/browser/extensions/api/web_request/web_request_apitest.cc
[modify] https://crrev.com/1c472ffdfc0d6ba628f08e08c4558246f98c6bd3/chrome/browser/extensions/background_xhr_browsertest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/444729a60f6700e82a9385392d584f1814cd9129

commit 444729a60f6700e82a9385392d584f1814cd9129
Author: Clark DuVall <cduvall@chromium.org>
Date: Wed Aug 08 23:09:54 2018

Reland "Fix flaky webrequest related network service tests in component builds"

This is a reland of 30d8a3b9d66558f01b026c11ffe7db2bbda6fc1e

This fixes an issue where FlushForTesting would timeout if the InterfacePtr
was destroyed in the middle of a flush. Also fixes a webview test that was
flaky on component builds.

Original change's description:
> Fix flaky webrequest related network service tests in component builds
>
> These tests needed some extra synchronization due to the changes made in
> http://crrev.com/c/1139048. These were flaking in component builds.
>
> Bug:  871224 
> Change-Id: Ibe370f9b9c8ebb94ee1dd21ba204c06e91518057
> Reviewed-on: https://chromium-review.googlesource.com/1163987
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#580980}

Bug:  871224 ,  871720 
Change-Id: Ib66c759ef422124f166583c57f89f0a56d92f841
Reviewed-on: https://chromium-review.googlesource.com/1165504
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581721}
[modify] https://crrev.com/444729a60f6700e82a9385392d584f1814cd9129/chrome/browser/extensions/api/declarative/declarative_apitest.cc
[modify] https://crrev.com/444729a60f6700e82a9385392d584f1814cd9129/chrome/browser/extensions/api/declarative_content/declarative_content_apitest.cc
[modify] https://crrev.com/444729a60f6700e82a9385392d584f1814cd9129/chrome/browser/extensions/api/declarative_content/set_icon_apitest.cc
[modify] https://crrev.com/444729a60f6700e82a9385392d584f1814cd9129/chrome/browser/extensions/api/web_request/web_request_apitest.cc
[modify] https://crrev.com/444729a60f6700e82a9385392d584f1814cd9129/chrome/browser/extensions/background_xhr_browsertest.cc
[modify] https://crrev.com/444729a60f6700e82a9385392d584f1814cd9129/extensions/test/data/web_view/apitest/main.js
[modify] https://crrev.com/444729a60f6700e82a9385392d584f1814cd9129/mojo/public/cpp/bindings/lib/control_message_proxy.cc