GTK: allow bookmark manager to MOVE as well as COPY.

BUG=41601
TEST=manual

Review URL: http://codereview.chromium.org/1610035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@44955 0039d316-1c4b-4281-b951-d872f2087c98
void BookmarkDrag::OnDragDataGet(GtkWidget* widget, GdkDragContext* context,
                                 GtkSelectionData* selection_data,
                                 guint target_type, guint time) {
  bookmark_utils::WriteBookmarksToSelection(nodes_, selection_data,
                                            target_type, profile_);
}

void BookmarkDrag::OnDragDataGet(GtkWidget* widget, GdkDragContext* context,
                                 GtkSelectionData* selection_data,
                                 guint target_type, guint time) {
  bookmark_utils::WriteBookmarksToSelection(nodes_, selection_data,
                                            target_type, profile_);
}
