chromeos: Improve ProxyResolutionServiceProvider testing.

chrome/browser/chromeos/dbus/chrome_proxy_resolver_delegate.h

Index: chrome/browser/chromeos/dbus/chrome_proxy_resolver_delegate.h
diff --git a/chrome/browser/chromeos/dbus/chrome_proxy_resolver_delegate.h b/chrome/browser/chromeos/dbus/chrome_proxy_resolver_delegate.h
index 62b6a2d1c3c2f91d16b7392b0acac03185a14dae..7feed702642ed298cd8fe315db7f915803a55798 100644
--- a/chrome/browser/chromeos/dbus/chrome_proxy_resolver_delegate.h
+++ b/chrome/browser/chromeos/dbus/chrome_proxy_resolver_delegate.h
@@ -11,14 +11,17 @@
 namespace chromeos {
 
 // Chrome's implementation of ProxyResolverDelegate.
-class ChromeProxyResolverDelegate
-    : public ProxyResolverDelegate {
+class ChromeProxyResolverDelegate : public ProxyResolverDelegate {
  public:
   ChromeProxyResolverDelegate();
   ~ChromeProxyResolverDelegate() override;
 
   // ProxyResolverDelegate override.
   scoped_refptr<net::URLRequestContextGetter> GetRequestContext() override;
+  int ResolveProxy(net::ProxyService* proxy_service,
+                   const GURL& url,
+                   net::ProxyInfo* results,
+                   const net::CompletionCallback& callback) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ChromeProxyResolverDelegate);