Pre-Condition: Enabled 'Site settings with All sites and Site details' flags from chrome://flags.

Narrow Bisect: https://chromium.googlesource.com/chromium/src/+log/40d2d2c96d1e739f06c5c096eed5b9bb91a0ea51..c1df3d4456b27362d65b06c7ee52a88d36af6fb4?pretty=fuller&n=100

Suspecting: r488086

This is caused by the UI in Site Details always adding new patterns instead of setting origin-scoped permissions. A CL to fix this should be landing soon here: https://chromium-review.googlesource.com/c/569551

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3

commit f603c205cd6a8ddabb2884658e2ab0ebce0b07e3
Author: Patricia Lor <patricialor@chromium.org>
Date: Tue Jul 25 04:44:12 2017

MD Settings: Add a non-pattern way to set origin permissions for Site Details.

Currently, setting origin-scoped permissions in "Site Details" calls
HostContentSettingMap::SetContentSettingCustomScope(). This is technically
supposed to only be used for setting ContentSettingPatterns, which can cross
over multiple origins, if the pattern allows for it.

To fix, implement a new method SiteSettingsHandler::HandleSetOriginPermissions,
which uses HostContentSettingMap::SetNarrowestContentSetting(), which only
handles origin-scoped permissions. This is more appropriate for Site Details,
which shows permissions for a specific origin.

"Site settings". When the "Site Details" page opens, change a few of the
permissions listed there away from the original setting, and verify that
a) The drop-down doesn't immediately switch back to the original setting.
b) Switching back to the tab with https://permission.site and opening the Page
Info bubble shows the change that was just made accurately.
c) Refreshing the "Site Details" page still shows the new setting in the
drop-downs.
Also try clicking the "Clear and Reset" button underneath all the permissions,
and verify that it sets all the permissions back to their default values (which
will show up in "Site Details" on refresh), and that this is reflected in the
Page Info bubble as well as "Site Details".

Bug:  656758 ,  747794 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I9fdae9214389a7da11bb03e5407f3b57c0da46dd
Test: Navigate to https://permission.site. Open the Page Info bubble, then click
Reviewed-on: https://chromium-review.googlesource.com/569551
Commit-Queue: Patti <patricialor@chromium.org>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Tim Sergeant <tsergeant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489232}
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/extensions/api/content_settings/content_settings_api.cc
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/extensions/api/content_settings/content_settings_store.cc
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/resources/settings/site_settings/add_site_dialog.js
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/resources/settings/site_settings/edit_exception_dialog.js
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/resources/settings/site_settings/site_details.js
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/resources/settings/site_settings/site_details_permission.js
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/resources/settings/site_settings/site_list.js
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/ui/webui/settings/site_settings_handler.cc
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/ui/webui/settings/site_settings_handler.h
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/browser/ui/webui/settings/site_settings_handler_unittest.cc
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/test/data/webui/settings/site_details_permission_tests.js
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/test/data/webui/settings/site_list_tests.js
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/chrome/test/data/webui/settings/test_site_settings_prefs_browser_proxy.js
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/components/content_settings/core/browser/content_settings_utils.cc
[modify] https://crrev.com/f603c205cd6a8ddabb2884658e2ab0ebce0b07e3/components/content_settings/core/browser/content_settings_utils_unittest.cc