In DevicePermissionsDialogView disable Connect button if no device selected

chrome/browser/ui/views/extensions/device_permissions_dialog_view.cc

Index: chrome/browser/ui/views/extensions/device_permissions_dialog_view.cc
diff --git a/chrome/browser/ui/views/extensions/device_permissions_dialog_view.cc b/chrome/browser/ui/views/extensions/device_permissions_dialog_view.cc
index 6f5d379cddcfa23f386cd1d1dab3ac9ef8e195ca..a8f490097f44db296021d23a46fd404020baa507 100644
--- a/chrome/browser/ui/views/extensions/device_permissions_dialog_view.cc
+++ b/chrome/browser/ui/views/extensions/device_permissions_dialog_view.cc
@@ -23,6 +23,7 @@
 #include "ui/views/controls/table/table_view.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/layout/layout_constants.h"
+#include "ui/views/window/dialog_client_view.h"
 
 using device::UsbDevice;
 using extensions::DevicePermissionsPrompt;
@@ -115,6 +116,7 @@ DevicePermissionsDialogView::DevicePermissionsDialogView(
                                      table_columns,
                                      views::TEXT_ONLY,
                                      !prompt_->multiple());
+  table_view_->SetObserver(this);
 
   views::View* table_parent = table_view_->CreateParentIfNecessary();
   AddChildView(table_parent);
@@ -147,6 +149,12 @@ base::string16 DevicePermissionsDialogView::GetDialogButtonLabel(
   return views::DialogDelegateView::GetDialogButtonLabel(button);
 }
 
+bool DevicePermissionsDialogView::IsDialogButtonEnabled(
+    ui::DialogButton button) const {
+  return button != ui::DIALOG_BUTTON_OK ||
+         !table_view_->selection_model().empty();
+}
+
 ui::ModalType DevicePermissionsDialogView::GetModalType() const {
   return ui::MODAL_TYPE_CHILD;
 }
@@ -159,6 +167,10 @@ gfx::Size DevicePermissionsDialogView::GetPreferredSize() const {
   return gfx::Size(500, 250);
 }
 
+void DevicePermissionsDialogView::OnSelectionChanged() {
+  GetDialogClientView()->UpdateDialogButtons();
+}
+
 void ChromeDevicePermissionsPrompt::ShowDialogViews() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);