Test GURL::spec() usage changes with DEPS rolled to the new version.

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 72e3416f3079a965c4795f9c40a1472698c8d720..8681252acb6bc03e90cd7f3a16a286b82ae847ab 100644
--- a/chrome/browser/chromeos/proxy_config_service_impl.cc
+++ b/chrome/browser/chromeos/proxy_config_service_impl.cc
@@ -295,8 +295,10 @@ bool ProxyConfigServiceImpl::ProxyConfig::DeserializeForDevice(
     mode = MODE_AUTO_DETECT;
   } else if (mode_string == ProxyPrefs::kPacScriptProxyModeName) {
     mode = MODE_PAC_SCRIPT;
-    if (proxy_proto.has_proxy_pac_url())
-      automatic_proxy.pac_url = GURL(proxy_proto.proxy_pac_url());
+    if (proxy_proto.has_proxy_pac_url()) {
+      GURL pac_url = GURL(proxy_proto.proxy_pac_url());
+      automatic_proxy.pac_url = pac_url.is_valid() ? pac_url : GURL();
+    }
   } else if (mode_string == ProxyPrefs::kFixedServersProxyModeName) {
     net::ProxyConfig::ProxyRules rules;
     rules.ParseFromString(proxy_proto.proxy_server());