Fix gperftools to not arm the profiling timer by default.

third_party/tcmalloc/chromium/src/tests/profile-handler_unittest.cc

Index: third_party/tcmalloc/chromium/src/tests/profile-handler_unittest.cc
diff --git a/third_party/tcmalloc/chromium/src/tests/profile-handler_unittest.cc b/third_party/tcmalloc/chromium/src/tests/profile-handler_unittest.cc
index 98cfe6d5bf6826d96045999639c86b39e631251b..e46ab834e77a982ed18ddf84c805c4515beebf4d 100644
--- a/third_party/tcmalloc/chromium/src/tests/profile-handler_unittest.cc
+++ b/third_party/tcmalloc/chromium/src/tests/profile-handler_unittest.cc
@@ -58,6 +58,7 @@ class Thread {
   static void* DoRun(void* cls) {
     ProfileHandlerRegisterThread();
     reinterpret_cast<Thread*>(cls)->Run();
+    ProfileHandlerUnregisterThread();
     return NULL;
   }
   pthread_t thread_;