Use tcmalloc's debugallocation for Debug builds

base/allocator/debugallocation_shim.cc

Index: base/allocator/debugallocation_shim.cc
diff --git a/base/test/main_hook.cc b/base/allocator/debugallocation_shim.cc
similarity index 51%
copy from base/test/main_hook.cc
copy to base/allocator/debugallocation_shim.cc
index f1f196160d52da36db7a34ac3e9c8c8e7d17a19c..d1cf52a23ea9f181fa92d3880837b8e2fd1c784f 100644
--- a/base/test/main_hook.cc
+++ b/base/allocator/debugallocation_shim.cc
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/test/main_hook.h"
-
-#if !defined(OS_IOS)
-MainHook::MainHook(MainType main_func, int argc, char* argv[]) {}
+#if defined(TCMALLOC_FOR_DEBUGALLOCATION)
+#include "third_party/tcmalloc/chromium/src/debugallocation.cc"
+#else
+#include "third_party/tcmalloc/chromium/src/tcmalloc.cc"
 #endif