linux_aura: Don't clear target vector in SelectionOwner.

ui/base/x/selection_owner.cc

Index: ui/base/x/selection_owner.cc
diff --git a/ui/base/x/selection_owner.cc b/ui/base/x/selection_owner.cc
index 54f59a162d4b2f777815ca8dc6e7b8760d185285..82c98a99fb12fd51fd0884ea511312fdefd8384f 100644
--- a/ui/base/x/selection_owner.cc
+++ b/ui/base/x/selection_owner.cc
@@ -39,7 +39,6 @@ SelectionOwner::~SelectionOwner() {
 }
 
 void SelectionOwner::RetrieveTargets(std::vector<Atom>* targets) {
-  targets->clear();
   for (SelectionFormatMap::const_iterator it = format_map_.begin();
        it != format_map_.end(); ++it) {
     targets->push_back(it->first);