Fix proxy from user policy on shared networks.

chrome/browser/chromeos/proxy_config_service_impl.cc

Index: chrome/browser/chromeos/proxy_config_service_impl.cc
diff --git a/chrome/browser/chromeos/proxy_config_service_impl.cc b/chrome/browser/chromeos/proxy_config_service_impl.cc
index 9134736f0fcce5e196eeb9c19d6a90bece5cce70..8b59c5d3872c05245466d2f82a228a8e3bcd14dc 100644
--- a/chrome/browser/chromeos/proxy_config_service_impl.cc
+++ b/chrome/browser/chromeos/proxy_config_service_impl.cc
@@ -140,6 +140,13 @@ bool ProxyConfigServiceImpl::IgnoreProxy(const PrefService* profile_prefs,
     VLOG(1) << "Respect proxy of not-shared networks.";
     return false;
   }
+  if (onc_source == ::onc::ONC_SOURCE_USER_POLICY) {
+    // Note that this case can occur if the network is shared (e.g. ethernet)
+    // but the proxy is determined by user policy.
+    // See https://crbug.com/454966 .
+    VLOG(1) << "Respect proxy from user policy although network is shared.";
+    return false;
+  }
   if (onc_source == ::onc::ONC_SOURCE_DEVICE_POLICY) {
     policy::BrowserPolicyConnectorChromeOS* connector =
         g_browser_process->platform_part()->browser_policy_connector_chromeos();