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diff --git a/base/debug/thread_heap_usage_tracker.h b/base/debug/thread_heap_usage_tracker.h
deleted file mode 100644
index 508a0a3973..0000000000
--- a/base/debug/thread_heap_usage_tracker.h
+++ /dev/null
@@ -1,117 +0,0 @@
-// Copyright 2016 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_DEBUG_THREAD_HEAP_USAGE_TRACKER_H_
-#define BASE_DEBUG_THREAD_HEAP_USAGE_TRACKER_H_
-
-#include <stdint.h>
-
-#include "base/allocator/features.h"
-#include "base/base_export.h"
-#include "base/threading/thread_checker.h"
-
-namespace base {
-namespace allocator {
-struct AllocatorDispatch;
-}  // namespace allocator
-
-namespace debug {
-
-// Used to store the heap allocator usage in a scope.
-struct ThreadHeapUsage {
-  // The cumulative number of allocation operations.
-  uint64_t alloc_ops;
-
-  // The cumulative number of allocated bytes. Where available, this is
-  // inclusive heap padding and estimated or actual heap overhead.
-  uint64_t alloc_bytes;
-
-  // Where available, cumulative number of heap padding and overhead bytes.
-  uint64_t alloc_overhead_bytes;
-
-  // The cumulative number of free operations.
-  uint64_t free_ops;
-
-  // The cumulative number of bytes freed.
-  // Only recorded if the underlying heap shim can return the size of an
-  // allocation.
-  uint64_t free_bytes;
-
-  // The maximal value of |alloc_bytes| - |free_bytes| seen for this thread.
-  // Only recorded if the underlying heap shim supports returning the size of
-  // an allocation.
-  uint64_t max_allocated_bytes;
-};
-
-// By keeping a tally on heap operations, it's possible to track:
-// - the number of alloc/free operations, where a realloc is zero or one
-//   of each, depending on the input parameters (see man realloc).
-// - the number of bytes allocated/freed.
-// - the number of estimated bytes of heap overhead used.
-// - the high-watermark amount of bytes allocated in the scope.
-// This in turn allows measuring the memory usage and memory usage churn over
-// a scope. Scopes must be cleanly nested, and each scope must be
-// destroyed on the thread where it's created.
-//
-// Note that this depends on the capabilities of the underlying heap shim. If
-// that shim can not yield a size estimate for an allocation, it's not possible
-// to keep track of overhead, freed bytes and the allocation high water mark.
-class BASE_EXPORT ThreadHeapUsageTracker {
- public:
-  ThreadHeapUsageTracker();
-  ~ThreadHeapUsageTracker();
-
-  // Start tracking heap usage on this thread.
-  // This may only be called on the thread where the instance is created.
-  // Note IsHeapTrackingEnabled() must be true.
-  void Start();
-
-  // Stop tracking heap usage on this thread and store the usage tallied.
-  // If |usage_is_exclusive| is true, the usage tallied won't be added to the
-  // outer scope's usage. If |usage_is_exclusive| is false, the usage tallied
-  // in this scope will also tally to any outer scope.
-  // This may only be called on the thread where the instance is created.
-  void Stop(bool usage_is_exclusive);
-
-  // After Stop() returns the usage tallied from Start() to Stop().
-  const ThreadHeapUsage& usage() const { return usage_; }
-
-  // Returns this thread's heap usage from the start of the innermost
-  // enclosing ThreadHeapUsageTracker instance, if any.
-  static ThreadHeapUsage GetUsageSnapshot();
-
-  // Enables the heap intercept. May only be called once, and only if the heap
-  // shim is available, e.g. if BUILDFLAG(USE_EXPERIMENTAL_ALLOCATOR_SHIM) is
-  // true.
-  static void EnableHeapTracking();
-
-  // Returns true iff heap tracking is enabled.
-  static bool IsHeapTrackingEnabled();
-
- protected:
-  // Exposed for testing only - note that it's safe to re-EnableHeapTracking()
-  // after calling this function in tests.
-  static void DisableHeapTrackingForTesting();
-
-  // Exposed for testing only.
-  static void EnsureTLSInitialized();
-
-  // Exposed to allow testing the shim without inserting it in the allocator
-  // shim chain.
-  static base::allocator::AllocatorDispatch* GetDispatchForTesting();
-
- private:
-  ThreadChecker thread_checker_;
-
-  // The heap usage at Start(), or the difference from Start() to Stop().
-  ThreadHeapUsage usage_;
-
-  // This thread's heap usage, non-null from Start() to Stop().
-  ThreadHeapUsage* thread_usage_;
-};
-
-}  // namespace debug
-}  // namespace base
-
-#endif  // BASE_DEBUG_THREAD_HEAP_USAGE_TRACKER_H_
-\ No newline at end of file