linux_aura: Fix dragging files into Dropbox.

ui/base/dragdrop/os_exchange_data_provider_aurax11.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/dragdrop/os_exchange_data_provider_aurax11.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/message_loop/message_pump_x11.h"
 #include "base/strings/string_util.h"
@@ skipping 157 matching lines @@
 
   std::vector<unsigned char> bytes;
   bytes.insert(bytes.end(), data, data + pickle.size());
   scoped_refptr<base::RefCountedMemory> mem(
       base::RefCountedBytes::TakeVector(&bytes));
 
   format_map_.Insert(atom_cache_.GetAtom(format.ToString().c_str()), mem);
 }
 
 bool OSExchangeDataProviderAuraX11::GetString(base::string16* result) const {
+  if (HasFile()) {
+    // Various Linux file managers both pass a list of file:// URIs and set the
+    // string representation to the URI. We explicitly don't want to return use
+    // this representation.
+    return false;
+  }
+
   std::vector< ::Atom> text_atoms = ui::GetTextAtomsFrom(&atom_cache_);
   std::vector< ::Atom> requested_types;
   ui::GetAtomIntersection(text_atoms, GetTargets(), &requested_types);
 
   ui::SelectionData data(format_map_.GetFirstOf(requested_types));
   if (data.IsValid()) {
     std::string text = data.GetText();
     *result = base::UTF8ToUTF16(text);
     return true;
   }
@@ skipping 97 matching lines @@
     return true;
   }
 
   return false;
 }
 
 bool OSExchangeDataProviderAuraX11::HasString() const {
   std::vector< ::Atom> text_atoms = ui::GetTextAtomsFrom(&atom_cache_);
   std::vector< ::Atom> requested_types;
   ui::GetAtomIntersection(text_atoms, GetTargets(), &requested_types);
-  return !requested_types.empty();
+  return !requested_types.empty() && !HasFile();
 }
 
 bool OSExchangeDataProviderAuraX11::HasURL() const {
   std::vector< ::Atom> url_atoms = ui::GetURLAtomsFrom(&atom_cache_);
   std::vector< ::Atom> requested_types;
   ui::GetAtomIntersection(url_atoms, GetTargets(), &requested_types);
 
   if (requested_types.empty())
     return false;
 
@@ skipping 143 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 // OSExchangeData, public:
 
 // static
 OSExchangeData::Provider* OSExchangeData::CreateProvider() {
   return new OSExchangeDataProviderAuraX11();
 }
 
 }  // namespace ui