Revert of [tracing] Dump child processes' memory metrics in browser

components/tracing/process_metrics_memory_dump_provider.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 COMPONENTS_TRACING_PROCESS_MEMORY_METRICS_DUMP_PROVIDER_H_
-#define COMPONENTS_TRACING_PROCESS_MEMORY_METRICS_DUMP_PROVIDER_H_
-
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/process/process_handle.h"
-#include "base/trace_event/memory_dump_provider.h"
-#include "build/build_config.h"
-#include "components/tracing/tracing_export.h"
-
-namespace base {
-class ProcessMetrics;
-}
-
-namespace tracing {
-
-// Dump provider which collects process-wide memory stats.
-class TRACING_EXPORT ProcessMetricsMemoryDumpProvider
-    : public base::trace_event::MemoryDumpProvider {
- public:
-  // Pass base::kNullProcessId to register for current process.
-  static void RegisterForProcess(base::ProcessId process);
-  static void UnregisterForProcess(base::ProcessId process);
-
-  ~ProcessMetricsMemoryDumpProvider() override;
-
-  // MemoryDumpProvider implementation.
-  bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
-                    base::trace_event::ProcessMemoryDump* pmd) override;
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(ProcessMetricsMemoryDumpProviderTest,
-                           ParseProcSmaps);
-  FRIEND_TEST_ALL_PREFIXES(ProcessMetricsMemoryDumpProviderTest, DumpRSS);
-
-  ProcessMetricsMemoryDumpProvider(base::ProcessId process);
-
-  bool DumpProcessTotals(const base::trace_event::MemoryDumpArgs& args,
-                         base::trace_event::ProcessMemoryDump* pmd);
-  bool DumpProcessMemoryMaps(const base::trace_event::MemoryDumpArgs& args,
-                             base::trace_event::ProcessMemoryDump* pmd);
-
-  static uint64_t rss_bytes_for_testing;
-
-#if defined(OS_LINUX) || defined(OS_ANDROID)
-  static FILE* proc_smaps_for_testing;
-#endif
-
-  base::ProcessId process_;
-  scoped_ptr<base::ProcessMetrics> process_metrics_;
-
-  // The peak may not be resettable on all the processes if the linux kernel is
-  // older than http://bit.ly/reset_rss or only on child processes if yama LSM
-  // sandbox is enabled.
-  bool is_rss_peak_resettable_;
-
-  DISALLOW_COPY_AND_ASSIGN(ProcessMetricsMemoryDumpProvider);
-};
-
-}  // namespace tracing
-
-#endif  // COMPONENTS_TRACING_PROCESS_MEMORY_METRICS_DUMP_PROVIDER_H_