Fix gperftools to not arm the profiling timer by default.

third_party/tcmalloc/chromium/src/tests/profiler_unittest.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 45 matching lines @@
 
   int i, m;
   char b[128];
   MutexLock ml(&mutex);
   for (m = 0; m < 1000000; ++m) {          // run millions of times
     for (i = 0; i < g_iters; ++i ) {
       result ^= i;
     }
     snprintf(b, sizeof(b), "other: %d", result);  // get some libc action
   }
+
+  ProfilerUnregisterThread();
 #endif
 }
 
 static void test_main_thread() {
   int i, m;
   char b[128];
   MutexLock ml(&mutex);
   for (m = 0; m < 1000000; ++m) {          // run millions of times
     for (i = 0; i < g_iters; ++i ) {
       result ^= i;
@@ skipping 57 matching lines @@
 #endif
 
   test_main_thread();
 
   if (filename) {
     ProfilerStop();
   }
 
   return 0;
 }