Fix gperftools to not arm the profiling timer by default.

third_party/tcmalloc/chromium/src/tests/profiler_unittest.cc

Index: third_party/tcmalloc/chromium/src/tests/profiler_unittest.cc
diff --git a/third_party/tcmalloc/chromium/src/tests/profiler_unittest.cc b/third_party/tcmalloc/chromium/src/tests/profiler_unittest.cc
index 399891bc58b7e811eb4a975e53825c95e4400f7f..2afe2095b24a40ca39760822dc9960d0135a5aa6 100644
--- a/third_party/tcmalloc/chromium/src/tests/profiler_unittest.cc
+++ b/third_party/tcmalloc/chromium/src/tests/profiler_unittest.cc
@@ -63,6 +63,8 @@ static void test_other_thread() {
     }
     snprintf(b, sizeof(b), "other: %d", result);  // get some libc action
   }
+
+  ProfilerUnregisterThread();
 #endif
 }