Allocator cleanup: move tcmalloc-specific calls to base

third_party/tcmalloc/chromium/src/tcmalloc.cc

 // 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 1728 matching lines @@
 #if defined(OS_LINUX)
 extern "C" void* PERFTOOLS_DLL_DECL tc_malloc_skip_new_handler(size_t size) {
   void* result = do_malloc(size);
   MallocHook::InvokeNewHook(result, size);
   return result;
 }
 #endif
 
 #endif  // TCMALLOC_USING_DEBUGALLOCATION
 
-#if defined(OS_LINUX)
-// Alias the weak symbol in chromium to our implementation.
-extern "C" __attribute__((visibility("default"), alias("tc_malloc_skip_new_handler")))
-void* tc_malloc_skip_new_handler_weak(size_t size);
-#endif
-
 // --- Validation implementation with an extra mark ----------------------------
 // We will put a mark at the extreme end of each allocation block.  We make
 // sure that we always allocate enough "extra memory" that we can fit in the
 // mark, and still provide the requested usable region.  If ever that mark is
 // not as expected, then we know that the user is corrupting memory beyond their
 // request size, or that they have called free a second time without having
 // the memory allocated (again).  This allows us to spot most double free()s,
 // but some can "slip by" or confuse our logic if the caller reallocates memory
 // (for a second use) before performing an evil double-free of a first
 // allocation
@@ skipping 137 matching lines @@
   *mark = ~allocated_mark;  //  Distinctively not allocated.
 }
 
 static void MarkAllocatedRegion(void* ptr) {
   if (ptr == NULL) return;
   MarkType* mark = GetMarkLocation(ptr);
   *mark = GetMarkValue(ptr, mark);
 }
 
 #endif  // TCMALLOC_VALIDATION