Turn adblock off by default

Ad blocking can be an intrusive action and can render some pages
inoperable. Some of those pages may be on relatively popular learning
sites desperately and poorly attempting to monetize their content. We
don't want to prevent access to those.

build/bromite_patches_list.txt

@@ -164,3 +164,4 @@ Add-flag-to-disable-pull-to-refresh-effect.patch
 Experimental-user-scripts-support.patch
 Enable-native-Android-autofill.patch
 Automated-domain-substitution.patch
+Turn-AdBlock-off-by-default.patch

build/patches/Turn-AdBlock-off-by-default.patch

@@ -0,0 +1,30 @@
+From b4680e3bf5dc20a8a87988a537da575096d9fb69 Mon Sep 17 00:00:00 2001
+From: Allen Luce <allen.luce@prometheanworld.com>
+Date: Thu, 13 Feb 2020 17:29:32 +0000
+Subject: [PATCH] Turn AdBlock off by default
+
+This disables the Bromite/NoChromo adblocking engine by default. Ad
+blocking causes some sites to not work properly, either due to
+ad-blocking detectors or due to broken page handling when ads don't
+appear.
+
+Ad blocking can be easily re-enabled via the drop-down hamburger
+menu. This should help to ensure that only users that know how to
+disable adblocking end up using it in the first place.
+---
+ .../content_settings/core/browser/content_settings_registry.cc  | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/components/content_settings/core/browser/content_settings_registry.cc b/components/content_settings/core/browser/content_settings_registry.cc
+index 6fff875f9c525..0a32f68f25a82 100644
+--- a/components/content_settings/core/browser/content_settings_registry.cc
++++ b/components/content_settings/core/browser/content_settings_registry.cc
+@@ -356,7 +356,7 @@ void ContentSettingsRegistry::Init() {
+            ContentSettingsInfo::EXCEPTIONS_ON_SECURE_AND_INSECURE_ORIGINS);
+ 
+   Register(ContentSettingsType::ADS, "subresource-filter",
+-           CONTENT_SETTING_BLOCK, WebsiteSettingsInfo::UNSYNCABLE,
++           CONTENT_SETTING_ALLOW, WebsiteSettingsInfo::UNSYNCABLE,
+            AllowlistedSchemes(),
+            ValidSettings(CONTENT_SETTING_ALLOW, CONTENT_SETTING_BLOCK),
+            WebsiteSettingsInfo::SINGLE_ORIGIN_ONLY_SCOPE,