direct_memory_pressure_calculator.h: remove 'virtual'

components/memory_pressure/direct_memory_pressure_calculator.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_MEMORY_PRESSURE_DIRECT_MEMORY_PRESSURE_CALCULATOR_H_
 #define COMPONENTS_MEMORY_PRESSURE_DIRECT_MEMORY_PRESSURE_CALCULATOR_H_
 
 #include "components/memory_pressure/memory_pressure_calculator.h"
 
 #include "base/process/process_metrics.h"
@@ skipping 20 matching lines @@
 
   // Default constructor. Will choose thresholds automatically based on the
   // actual amount of system memory installed.
   DirectMemoryPressureCalculator();
 
   // Constructor with explicit memory thresholds. These represent the amount of
   // free memory below which the applicable memory pressure state applies.
   DirectMemoryPressureCalculator(int moderate_threshold_mb,
                                  int critical_threshold_mb);
 
-  virtual ~DirectMemoryPressureCalculator() override {}
+  ~DirectMemoryPressureCalculator() override {}
 
   // Calculates the current pressure level.
   MemoryPressureLevel CalculateCurrentPressureLevel() override;
 
 #if defined(OS_WIN)
   int moderate_threshold_mb() const { return moderate_threshold_mb_; }
   int critical_threshold_mb() const { return critical_threshold_mb_; }
 #endif
 
  private:
@@ skipping 16 matching lines @@
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(DirectMemoryPressureCalculator);
 };
 
 #endif  // defined(MEMORY_PRESSURE_IS_POLLING)
 
 }  // namespace memory_pressure
 
 #endif  // COMPONENTS_MEMORY_PRESSURE_DIRECT_MEMORY_PRESSURE_CALCULATOR_H_