Split Chromoting's Disconnect button text into 2 parts: name + hotkeys.

remoting/host/disconnect_window_linux.cc

Index: remoting/host/disconnect_window_linux.cc
diff --git a/remoting/host/disconnect_window_linux.cc b/remoting/host/disconnect_window_linux.cc
index bfd2e1c5708f7ecfbea8d1cc680f8bb890565b50..280c43dec5a4e15d959b07ef47d51e5b12cd7175 100644
--- a/remoting/host/disconnect_window_linux.cc
+++ b/remoting/host/disconnect_window_linux.cc
@@ -45,11 +45,13 @@ DisconnectWindowLinux::~DisconnectWindowLinux() {
 void DisconnectWindowLinux::CreateWindow() {
   if (disconnect_window_) return;
 
+  std::string disconnect_button(kDisconnectButton);
+  disconnect_button += kDisconnectKeysLinux;
   disconnect_window_ = gtk_dialog_new_with_buttons(
       kTitle,
       NULL,
       GTK_DIALOG_NO_SEPARATOR,
-      kDisconnectButton, GTK_RESPONSE_OK,
+      disconnect_button.c_str(), GTK_RESPONSE_OK,
       NULL);
 
   GtkWindow* window = GTK_WINDOW(disconnect_window_);