In DevicePermissionsViewController disable Connect button if no device selected on Mac

chrome/browser/ui/cocoa/extensions/device_permissions_view_controller.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "base/mac/bundle_locations.h"
 #include "base/strings/sys_string_conversions.h"
 #import "chrome/browser/ui/cocoa/extensions/device_permissions_dialog_controller.h"
 #import "chrome/browser/ui/cocoa/extensions/device_permissions_view_controller.h"
 #include "chrome/grit/generated_resources.h"
 #include "grit/components_strings.h"
@@ skipping 28 matching lines @@
 
 - (void)devicesChanged {
   [tableView_ reloadData];
 }
 
 - (void)awakeFromNib {
   [titleField_ setStringValue:base::SysUTF16ToNSString(prompt_->GetHeading())];
   [promptField_
       setStringValue:base::SysUTF16ToNSString(prompt_->GetPromptMessage())];
   [tableView_ setAllowsMultipleSelection:prompt_->multiple()];
+  [tableView_ setDelegate:self];
+  [tableView_ setDataSource:self];
   [[deviceNameColumn_ headerCell]
       setStringValue:l10n_util::GetNSString(
                          IDS_DEVICE_PERMISSIONS_DIALOG_DEVICE_NAME_COLUMN)];
   [[serialNumberColumn_ headerCell]
       setStringValue:l10n_util::GetNSString(
                          IDS_DEVICE_PERMISSIONS_DIALOG_SERIAL_NUMBER_COLUMN)];
   [okButton_
       setTitle:l10n_util::GetNSString(IDS_DEVICE_PERMISSIONS_DIALOG_SELECT)];
+  [okButton_ setEnabled:NO];
   [cancelButton_ setTitle:l10n_util::GetNSString(IDS_CANCEL)];
 }
 
 - (NSInteger)numberOfRowsInTableView:(NSTableView*)tableView {
   DCHECK_EQ(tableView_, tableView);
   return prompt_->GetDeviceCount();
 }
 
 - (id)tableView:(NSTableView*)tableView
     objectValueForTableColumn:(NSTableColumn*)tableColumn
                           row:(NSInteger)rowIndex {
   if (tableColumn == deviceNameColumn_) {
     return base::SysUTF16ToNSString(prompt_->GetDeviceName(rowIndex));
   } else if (tableColumn == serialNumberColumn_) {
     return base::SysUTF16ToNSString(prompt_->GetDeviceSerialNumber(rowIndex));
   } else {
     NOTREACHED();
     return @"";
   }
 }
 
+- (void)tableViewSelectionDidChange:(NSNotification*)aNotification {
+  [okButton_ setEnabled:[tableView_ numberOfSelectedRows] > 0];
+}
+
 @end