Fix gperftools to not arm the profiling timer by default.

third_party/tcmalloc/chromium/src/gperftools/profiler.h

 /* 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 132 matching lines @@
 PERFTOOLS_DLL_DECL void ProfilerEnable();
 PERFTOOLS_DLL_DECL void ProfilerDisable();
 
 /* Returns nonzero if profile is currently enabled, zero if it's not. */
 PERFTOOLS_DLL_DECL int ProfilingIsEnabledForAllThreads();
 
 /* Routine for registering new threads with the profiler.
  */
 PERFTOOLS_DLL_DECL void ProfilerRegisterThread();
 
+/* Routine for unregistering new threads with the profiler.
+ */
+PERFTOOLS_DLL_DECL void ProfilerUnregisterThread();
+
 /* Stores state about profiler's current status into "*state". */
 struct ProfilerState {
   int    enabled;             /* Is profiling currently enabled? */
   time_t start_time;          /* If enabled, when was profiling started? */
   char   profile_name[1024];  /* Name of profile file being written, or '\0' */
   int    samples_gathered;    /* Number of samples gathered so far (or 0) */
 };
 PERFTOOLS_DLL_DECL void ProfilerGetCurrentState(struct ProfilerState* state);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  /* BASE_PROFILER_H_ */