chromeos: Simplify D-Bus proxy provider (but not tests).

chrome/browser/chromeos/dbus/chrome_proxy_resolution_service_provider_delegate.h

Index: chrome/browser/chromeos/dbus/chrome_proxy_resolution_service_provider_delegate.h
diff --git a/chrome/browser/chromeos/dbus/chrome_proxy_resolution_service_provider_delegate.h b/chrome/browser/chromeos/dbus/chrome_proxy_resolution_service_provider_delegate.h
index 9124602b2ea2484a0d4591209944c16a1d4ec57e..6c298bf94ef00491227e64e83d1d7716ace0af67 100644
--- a/chrome/browser/chromeos/dbus/chrome_proxy_resolution_service_provider_delegate.h
+++ b/chrome/browser/chromeos/dbus/chrome_proxy_resolution_service_provider_delegate.h
@@ -19,10 +19,6 @@ class ChromeProxyResolutionServiceProviderDelegate
 
   // ProxyResolutionServiceProvider::Delegate:
   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(ChromeProxyResolutionServiceProviderDelegate);