Fix copying from Java AWT app and pasting into Chrome on Linux.

ui/base/clipboard/clipboard_gtk.cc

 // Copyright (c) 2012 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.
 
 #include "ui/base/clipboard/clipboard.h"
 
 #include <gtk/gtk.h>
 #include <X11/extensions/Xfixes.h>
 #include <X11/Xatom.h>
 #include <map>
@@ skipping 349 matching lines @@
 
   bool retval = false;
   GtkSelectionData* data = gtk_clipboard_wait_for_contents(
       clipboard, gdk_atom_intern_static_string("TARGETS"));
 
   bool format_is_plain_text = GetPlainTextFormatType().Equals(format);
   if (format_is_plain_text) {
     // This tries a number of common text targets.
     if (data) {
       retval = gtk_selection_data_targets_include_text(data);
-    } else {
+    }
+    // Some programs like Java decide to set an empty TARGETS list, so even if
+    // data is not NULL, we still have to fall back.
+    if (!retval) {
       // Some programs post data to the clipboard without any targets. If this
       // is the case we attempt to make sense of the contents as text. This is
       // pretty unfortunate since it means we have to actually copy the data to
       // see if it is available, but at least this path shouldn't be hit for
       // conforming programs.
       gchar* text = gtk_clipboard_wait_for_text(clipboard);
       if (text) {
         g_free(text);
         retval = true;
       }
@@ skipping 248 matching lines @@
       return clipboard_;
     case BUFFER_SELECTION:
       return primary_selection_;
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 }  // namespace ui