linux_aura: Fix crash when dragging NTP icons.

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_aurax11.h"
 #include "base/strings/string_util.h"
@@ skipping 178 matching lines @@
     // but that doesn't match the assumptions of the rest of the system which
     // expect single types.
 
     if (data.GetType() == atom_cache_.GetAtom(kMimeTypeMozillaURL)) {
       // Mozilla URLs are (UTF16: URL, newline, title).
       base::string16 unparsed;
       data.AssignTo(&unparsed);
 
       std::vector<base::string16> tokens;
       size_t num_tokens = Tokenize(unparsed, ASCIIToUTF16("\n"), &tokens);
-      if (num_tokens >= 2) {
+      if (num_tokens > 0) {
+        if (num_tokens > 1)
+          *title = tokens[1];
+        else
+          *title = string16();
+
         *url = GURL(tokens[0]);
-        *title = tokens[1];
         return true;
-      } else {
-        NOTREACHED() << "Data that claimed to be a Mozilla URL has "
-                     << num_tokens << " tokens instead of 2.";
       }
     } else if (data.GetType() == atom_cache_.GetAtom(
                    Clipboard::kMimeTypeURIList)) {
       // uri-lists are newline separated file lists in URL encoding.
       std::string unparsed;
       data.AssignTo(&unparsed);
 
       std::vector<std::string> tokens;
       size_t num_tokens = Tokenize(unparsed, "\n", &tokens);
       if (!num_tokens) {
@@ skipping 156 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 // OSExchangeData, public:
 
 // static
 OSExchangeData::Provider* OSExchangeData::CreateProvider() {
   return new OSExchangeDataProviderAuraX11();
 }
 
 }  // namespace ui