Fix OS_MACOS typos. Should be OS_MACOSX.

BUG=163208
TEST=none

Review URL: https://codereview.chromium.org/12829005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@189130 0039d316-1c4b-4281-b951-d872f2087c98
  void SendKeyToPopupAndWait(ui::KeyboardCode key) {
    if (!external_delegate_) {
      SendKeyToPageAndWait(key);
      return;
    }

    content::NativeWebKeyboardEvent event;
    event.windowsKeyCode = key;
    test_delegate_.Reset();
    external_delegate_->keyboard_listener()->HandleKeyPressEvent(event);
    test_delegate_.Wait();
  }

  void SendKeyToPopupAndWait(ui::KeyboardCode key) {
    if (!external_delegate_) {
      SendKeyToPageAndWait(key);
      return;
    }

    content::NativeWebKeyboardEvent event;
    event.windowsKeyCode = key;
    test_delegate_.Reset();
    external_delegate_->keyboard_listener()->HandleKeyPressEvent(event);
    test_delegate_.Wait();
  }
