Fix gperftools to not arm the profiling timer by default.

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

 // Copyright 2009 Google Inc. All Rights Reserved.
 // Author: Nabeel Mian (nabeelmian@google.com)
 //         Chris Demetriou (cgd@google.com)
 //
 // This file contains the unit tests for profile-handler.h interface.
 //
 // It is linked into three separate unit tests:
 //     profile-handler_unittest tests basic functionality
 //     profile-handler_disable_test tests that the profiler
 //         is disabled with --install_signal_handlers=false
@@ skipping 40 matching lines @@
   }
   void Join()  {
     assert(joinable_);
     pthread_join(thread_, NULL);
   }
   virtual void Run() = 0;
  private:
   static void* DoRun(void* cls) {
     ProfileHandlerRegisterThread();
     reinterpret_cast<Thread*>(cls)->Run();
+    ProfileHandlerUnregisterThread();
     return NULL;
   }
   pthread_t thread_;
   bool joinable_;
 };
 
 // Sleep interval in nano secs. ITIMER_PROF goes off only afer the specified CPU
 // time is consumed. Under heavy load this process may no get scheduled in a
 // timely fashion. Therefore, give enough time (20x of ProfileHandle timer
 // interval 10ms (100Hz)) for this process to accumulate enought CPU time to get
@@ skipping 426 matching lines @@
   if (FLAGS_test_profiler_signal_handler) {
     EXPECT_EQ(FLAGS_test_profiler_enabled, IsSignalEnabled());
   }
 }
 
 }  // namespace
 
 int main(int argc, char** argv) {
   return ProfileHandlerTest::RUN_ALL_TESTS();
 }