Build Chromium with IPv6 disabled

args.gn

# Set build arguments here. See `gn help buildargs`.
is_debug = false
is_component_build = false
symbol_level = 0
cc_wrapper="env CCACHE_SLOPPINESS=time_macros ccache"
google_api_key="AIzaSyDwr302FpOSkGRpLlUpPThNTDPbXcIn_FM"

build.sh

#!/usr/bin/env bash

set -e

CWD="$(pwd)"

echo "Setting up build environment..."
DEPOT_TOOLS_DIR="$(realpath ~/Projects)/depot_tools"
if [ -d "$DEPOT_TOOLS_DIR" ]; then
	echo "Updating depot_tools..."
	cd "$DEPOT_TOOLS_DIR"
	git pull origin main
else
	echo "Cloning depot_tools..."
	git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git "$DEPOT_TOOLS_DIR"
fi
export PATH="$DEPOT_TOOLS_DIR:$PATH"

echo "Setting up Chromium source..."
CHROMIUM_DIR="$(realpath ~/Projects)/chromium"
if [ -d "$CHROMIUM_DIR" ]; then
	echo "Updating Chromium source..."
	cd "$CHROMIUM_DIR"
	gclient sync
else
	echo "Cloning Chromium source..."
	mkdir -p "$CHROMIUM_DIR"
	cd "$CHROMIUM_DIR"
	caffeinate fetch chromium
fi

echo "Entering Chromium source directory..."
CHROMIUM_SRC_DIR="$CHROMIUM_DIR/src"
cd "$CHROMIUM_SRC_DIR"

echo "Setting up Git configuration..."
git update-index --test-untracked-cache
git config core.untrackedCache true
git config core.fsmonitor true

echo "Generating build files..."
gn gen out/Default
cp "$CWD/args.gn" out/Default/args.gn

echo "Applying patch..."
git apply "$CWD/chromium-disable-ipv6.patch" || echo "Failed to apply patch"

echo "Building Chromium..."
autoninja -C out/Default chrome

chromium-disable-ipv6.patch

diff --git a/net/dns/host_resolver_manager.cc b/net/dns/host_resolver_manager.cc
index e23ea3fe9883a..086afe9fa4c2f 100644
--- a/net/dns/host_resolver_manager.cc
+++ b/net/dns/host_resolver_manager.cc
@@ -789,8 +789,8 @@ void HostResolverManager::InitializeJobKeyAndIPAddress(
   // resolution based on a probe. Prior logic ensures that this is an automatic
   // query, so the code requesting the resolution should be amenable to
   // receiving an IPv6 resolution.
-  if (!use_local_ipv6 && !is_ip && !last_ipv6_probe_result_ &&
-      !ipv6_reachability_override_) {
+  if ((!use_local_ipv6 && !is_ip && !last_ipv6_probe_result_ &&
+      !ipv6_reachability_override_) || 1) {
     out_job_key.flags |= HOST_RESOLVER_DEFAULT_FAMILY_SET_DUE_TO_NO_IPV6;
     effective_types.Remove(DnsQueryType::AAAA);
   }