Turn NULL used as int to 0....

app/clipboard/clipboard_linux.cc

 // Copyright (c) 2009 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 "app/clipboard/clipboard.h"
 
 #include <gtk/gtk.h>
 #include <map>
 #include <set>
 #include <string>
@@ skipping 186 matching lines @@
 }
 
 void Clipboard::WriteBookmark(const char* title_data, size_t title_len,
                               const char* url_data, size_t url_len) {
   // Write as plain text.
   WriteText(url_data, url_len);
 
   // Write as a URI.
   char* data = new char[url_len + 1];
   memcpy(data, url_data, url_len);
-  data[url_len] = NULL;
+  data[url_len] = '\0';
   InsertMapping(kMimeURI, data, url_len + 1);
 }
 
 void Clipboard::WriteFiles(const char* file_data, size_t file_len) {
   NOTIMPLEMENTED();
 }
 
 void Clipboard::WriteData(const char* format_name, size_t format_len,
                           const char* data_data, size_t data_len) {
   char* data = new char[data_len];
@@ skipping 183 matching lines @@
     case BUFFER_SELECTION:
       result = primary_selection_;
       break;
     default:
       NOTREACHED();
       result = NULL;
       break;
   }
   return result;
 }