Fix a couple of gcc 4.8 warnings in tcmalloc.

third_party/tcmalloc/chromium/src/heap-profiler.cc

 // Copyright (c) 2005, Google Inc.
 // All rights reserved.
 // 
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 // 
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 341 matching lines @@
       need_to_dump = true;
     } else if (FLAGS_heap_profile_inuse_interval > 0 &&
                inuse_bytes >
                high_water_mark + FLAGS_heap_profile_inuse_interval) {
       snprintf(buf, sizeof(buf), "%" PRId64 " MB currently in use",
                inuse_bytes >> 20);
       need_to_dump = true;
     } else if (FLAGS_heap_profile_time_interval > 0 &&
                current_time - last_dump_time >=
                FLAGS_heap_profile_time_interval) {
-      snprintf(buf, sizeof(buf), "%d sec since the last dump",
+      snprintf(buf, sizeof(buf), "%" PRId64 " sec since the last dump",
                current_time - last_dump_time);
       need_to_dump = true;
       last_dump_time = current_time;
     }
     if (need_to_dump) {
       DumpProfileLocked(buf);
 
       last_dump_alloc = total.alloc_size;
       last_dump_free = total.free_size;
       if (inuse_bytes > high_water_mark)
@@ skipping 313 matching lines @@
 
 // class used for finalization -- dumps the heap-profile at program exit
 struct HeapProfileEndWriter {
   ~HeapProfileEndWriter() { HeapProfilerDump("Exiting"); }
 };
 
 // We want to make sure tcmalloc is up and running before starting the profiler
 static const TCMallocGuard tcmalloc_initializer;
 REGISTER_MODULE_INITIALIZER(heapprofiler, HeapProfilerInit());
 static HeapProfileEndWriter heap_profile_end_writer;