So a couple of browser tests fail on enabling runtime host permissions on the bots- 
ExtensionApiTest.ActiveTab
BrowserActionsBarIncognitoTest.IncognitoMode

These will need to be fixed.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/da05d4bb9604b81fa23a30858f04b70abd6be1d3

commit da05d4bb9604b81fa23a30858f04b70abd6be1d3
Author: Karan Bhatia <karandeepb@chromium.org>
Date: Mon Sep 24 21:29:55 2018

CTS: Make ExtensionAPITest.ActiveTab work with runtime host permissions enabled.

Currently the ExtensionAPITest.ActiveTab fails with the RuntimeHostPermissions
feature since it assumes that the active tab access grant is revoked when the
page is navigated. However, with the runtime host permissions feature enabled,
the active tab grant is only revoked when the page navigates to a different
origin. Fix the test and also test the behavior with RuntimeHostPermissions
enabled.

This is in preparation of enabling RuntimeHostPermissions for field trial
testing.

BUG= 888158 

Change-Id: I46c2c1f92d273eff80395642d0fe2733528cdf70
Reviewed-on: https://chromium-review.googlesource.com/1239210
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593691}
[modify] https://crrev.com/da05d4bb9604b81fa23a30858f04b70abd6be1d3/chrome/browser/extensions/active_tab_apitest.cc
[modify] https://crrev.com/da05d4bb9604b81fa23a30858f04b70abd6be1d3/chrome/test/data/extensions/api_test/active_tab/background.js

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1308b111ab0c596d40d16ce937c6f4661f37c970

commit 1308b111ab0c596d40d16ce937c6f4661f37c970
Author: Karan Bhatia <karandeepb@chromium.org>
Date: Mon Sep 24 22:39:39 2018

CTS: Fix BrowserActionsBarIncognitoTest.IncognitoMode with RuntimeHostPermissions feature.

Currently BrowserActionsBarIncognitoTest.IncognitoMode crashes when the
RuntimeHostPermissions feature is enabled since the test calls
ExtensionActionViewController::GetIcon with a null web-contents. This ends up
calling ExtensionActionViewController::GetPageInteractionStatus() which accesses
the null web-contents.

Fix this by using InProcessBrowserTest::CreateBrowser which waits for the
browser to have a valid tab.

BUG= 888158 

Change-Id: I7b763ff54f2a0d65e199582a9ab00549e549f8c0
Reviewed-on: https://chromium-review.googlesource.com/1239458
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593719}
[modify] https://crrev.com/1308b111ab0c596d40d16ce937c6f4661f37c970/chrome/browser/ui/toolbar/browser_actions_bar_browsertest.cc

Fixed in https://chromium-review.googlesource.com/c/chromium/src/+/1239204.