1diff --git a/base/memory/shared_memory_mapping.cc b/base/memory/shared_memory_mapping.cc
2index 005e3fc..2b42928 100644
3--- a/base/memory/shared_memory_mapping.cc
4+++ b/base/memory/shared_memory_mapping.cc
5@@ -7,7 +7,8 @@
6 #include <utility>
7
8 #include "base/logging.h"
9-#include "base/memory/shared_memory_tracker.h"
10+// Unsupported in libchrome
11+// #include "base/memory/shared_memory_tracker.h"
12 #include "base/unguessable_token.h"
13 #include "build/build_config.h"
14
15@@ -62,14 +63,15 @@ SharedMemoryMapping::SharedMemoryMapping(void* memory,
16                                          size_t mapped_size,
17                                          const UnguessableToken& guid)
18     : memory_(memory), size_(size), mapped_size_(mapped_size), guid_(guid) {
19-  SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
20+  // Unsupported in libchrome.
21+  // SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
22 }
23
24 void SharedMemoryMapping::Unmap() {
25   if (!IsValid())
26     return;
27-
28-  SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
29+  // Unsupported in libchrome.
30+  // SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
31 #if defined(OS_WIN)
32   if (!UnmapViewOfFile(memory_))
33     DPLOG(ERROR) << "UnmapViewOfFile";
34