Enable TCMalloc on Linux by default.

base/process_util_linux.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/process_util.h"
 
 #include <ctype.h>
 #include <dirent.h>
 #include <dlfcn.h>
 #include <errno.h>
@@ skipping 496 matching lines @@
 }
 
 void OnNoMemory() {
   OnNoMemorySize(0);
 }
 
 }  // namespace
 
 extern "C" {
 
-#if defined(LINUX_USE_TCMALLOC)
-
-int tc_set_new_mode(int mode);
-
-#else  // defined(LINUX_USE_TCMALLOC)
+#if !defined(LINUX_USE_TCMALLOC)
 
 typedef void* (*malloc_type)(size_t size);
 typedef void* (*valloc_type)(size_t size);
 typedef void* (*pvalloc_type)(size_t size);
 
 typedef void* (*calloc_type)(size_t nmemb, size_t size);
 typedef void* (*realloc_type)(void *ptr, size_t size);
 typedef void* (*memalign_type)(size_t boundary, size_t size);
 
 typedef int (*posix_memalign_type)(void **memptr, size_t alignment,
@@ skipping 45 matching lines @@
 DIE_ON_OOM_1(malloc)
 DIE_ON_OOM_1(valloc)
 DIE_ON_OOM_1(pvalloc)
 
 DIE_ON_OOM_2(calloc, size_t)
 DIE_ON_OOM_2(realloc, void*)
 DIE_ON_OOM_2(memalign, size_t)
 
 DIE_ON_OOM_3INT(posix_memalign)
 
-#endif  // defined(LINUX_USE_TCMALLOC)
+#endif  // !defined(LINUX_USE_TCMALLOC)
 
 }  // extern C
 
 void EnableTerminationOnOutOfMemory() {
   // Set the new-out of memory handler.
   std::set_new_handler(&OnNoMemory);
   // If we're using glibc's allocator, the above functions will override
   // malloc and friends and make them die on out of memory.
-#if defined(LINUX_USE_TCMALLOC)
-  // For tcmalloc, we just need to tell it to behave like new.
-  tc_set_new_mode(1);
-#endif
 }
 
 }  // namespace base