Update from https://crrev.com/328418

base/trace_event/memory_dump_session_state.h

 // Copyright 2015 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.
 
 #ifndef BASE_TRACE_EVENT_MEMORY_DUMP_SESSION_STATE_H_
 #define BASE_TRACE_EVENT_MEMORY_DUMP_SESSION_STATE_H_
 
 #include <string>
 
 #include "base/base_export.h"
 #include "base/memory/ref_counted.h"
-#include "base/trace_event/memory_allocator_attributes_type_info.h"
 
 namespace base {
 namespace trace_event {
 
+// Container for state variables that should be shared across all the memory
+// dumps in a tracing session.
 class BASE_EXPORT MemoryDumpSessionState
     : public RefCountedThreadSafe<MemoryDumpSessionState> {
  public:
   MemoryDumpSessionState();
-  MemoryAllocatorAttributesTypeInfo allocators_attributes_type_info;
 
  private:
   friend class RefCountedThreadSafe<MemoryDumpSessionState>;
   ~MemoryDumpSessionState();
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_MEMORY_DUMP_SESSION_STATE_H_