Return unique_ptrs from base::ProcessMetrics.

components/memory_pressure/direct_memory_pressure_calculator_linux.h

 // 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 COMPONENTS_MEMORY_PRESSURE_DIRECT_MEMORY_PRESSURE_CALCULATOR_LINUX_H_
 #define COMPONENTS_MEMORY_PRESSURE_DIRECT_MEMORY_PRESSURE_CALCULATOR_LINUX_H_
 
+#include "base/macros.h"
+#include "base/process/process_metrics.h"
 #include "components/memory_pressure/memory_pressure_calculator.h"
 
-#include "base/files/scoped_file.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "base/process/process_metrics.h"
-#include "base/timer/timer.h"
-
 namespace memory_pressure {
 
 // OS-specific implementation of MemoryPressureCalculator. This is only defined
 // and used on platforms that do not have native memory pressure signals
 // (ChromeOS, Linux, Windows). OSes that do have native signals simply hook into
 // the appropriate subsystem (Android, Mac OS X).
 class DirectMemoryPressureCalculator : public MemoryPressureCalculator {
  public:
   // Exposed for unittesting. See .cc file for detailed discussion of these
   // constants.
@@ skipping 33 matching lines @@
   // these.
   int moderate_threshold_mb_;
   int critical_threshold_mb_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectMemoryPressureCalculator);
 };
 
 }  // namespace memory_pressure
 
 #endif  // COMPONENTS_MEMORY_PRESSURE_DIRECT_MEMORY_PRESSURE_CALCULATOR_LINUX_H_