libchrome_tools/patch/shared_memory_mapping.patch

diff --git a/base/memory/shared_memory_mapping.cc b/base/memory/shared_memory_mapping.cc
index 005e3fc..2b42928 100644
--- a/base/memory/shared_memory_mapping.cc
+++ b/base/memory/shared_memory_mapping.cc
@@ -7,7 +7,8 @@
 #include <utility>
 
 #include "base/logging.h"
-#include "base/memory/shared_memory_tracker.h"
+// Unsupported in libchrome
+// #include "base/memory/shared_memory_tracker.h"
 #include "base/unguessable_token.h"
 #include "build/build_config.h"
 
@@ -62,14 +63,15 @@ SharedMemoryMapping::SharedMemoryMapping(void* memory,
                                          size_t mapped_size,
                                          const UnguessableToken& guid)
     : memory_(memory), size_(size), mapped_size_(mapped_size), guid_(guid) {
-  SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
+  // Unsupported in libchrome.
+  // SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
 }
 
 void SharedMemoryMapping::Unmap() {
   if (!IsValid())
     return;
-
-  SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
+  // Unsupported in libchrome.
+  // SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
 #if defined(OS_WIN)
   if (!UnmapViewOfFile(memory_))
     DPLOG(ERROR) << "UnmapViewOfFile";