Fix output string of pepper_hash_for_uma.

ppapi/tools/pepper_hash_for_uma.cc

 // Copyright (c) 2014 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.
 //
 // This is a utility executable used for generating hashes for pepper
 // interfaces for inclusion in tools/metrics/histograms/histograms.xml. Every
 // interface-version pair must have a corresponding entry in the enum there.
 //
 // The hashing logic here must match the hashing logic at
 // ppapi/proxy/interface_list.cc.
@@ skipping 13 matching lines @@
     fprintf(stderr, "Example: %s \"PPB_Var;1.1\" \"PPB_FileIO;1.2\"\n",
             argv[0]);
     return 1;
   }
   for (int i = 1; i < argc; i++) {
     uint32 data = base::Hash(argv[i], strlen(argv[i]));
 
     // Strip off the signed bit because UMA doesn't support negative values,
     // but takes a signed int as input.
     int hash = static_cast<int>(data & 0x7fffffff);
-    printf("<int value=\"%d\" label=\"%s\">\n", hash, argv[i]);
+    printf("<int value=\"%d\" label=\"%s\"/>\n", hash, argv[i]);
   }
   return 0;
 }