Move GetPrintHandler to CefClient (see issue #2196)

This new location is preferred because we now know the associated CefBrowser
for all CefPrintHandler callbacks.

tests/ceftests/client_app_delegates.cc

@@ -119,11 +119,6 @@ void ClientAppBrowser::CreateDelegates(DelegateSet& delegates) {
   ::CreateBrowserDelegates(delegates);
 }
 
-// static
-CefRefPtr<CefPrintHandler> ClientAppBrowser::CreatePrintHandler() {
-  return nullptr;
-}
-
 // static
 void ClientAppRenderer::CreateDelegates(DelegateSet& delegates) {
   ::CreateRenderDelegates(delegates);