[Mac] Report statistics more regularly in Mac memory pressure monitor

base/memory/memory_pressure_monitor_chromeos.h

 // Copyright 2014 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_MEMORY_MEMORY_PRESSURE_MONITOR_CHROMEOS_H_
 #define BASE_MEMORY_MEMORY_PRESSURE_MONITOR_CHROMEOS_H_
 
 #include "base/base_export.h"
 #include "base/files/scoped_file.h"
 #include "base/macros.h"
@@ skipping 40 matching lines @@
 
   explicit MemoryPressureMonitor(MemoryPressureThresholds thresholds);
   ~MemoryPressureMonitor() override;
 
   // Redo the memory pressure calculation soon and call again if a critical
   // memory pressure prevails. Note that this call will trigger an asynchronous
   // action which gives the system time to release memory back into the pool.
   void ScheduleEarlyCheck();
 
   // Get the current memory pressure level.
-  MemoryPressureListener::MemoryPressureLevel GetCurrentPressureLevel() const
+  MemoryPressureListener::MemoryPressureLevel GetCurrentPressureLevel()
       override;
   void SetDispatchCallback(const DispatchCallback& callback) override;
 
   // Returns a type-casted version of the current memory pressure monitor. A
   // simple wrapper to base::MemoryPressureMonitor::Get.
   static MemoryPressureMonitor* Get();
 
  private:
   friend TestMemoryPressureMonitor;
   // Starts observing the memory fill level.
@@ skipping 47 matching lines @@
 
   base::WeakPtrFactory<MemoryPressureMonitor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitor);
 };
 
 }  // namespace chromeos
 }  // namespace base
 
 #endif  // BASE_MEMORY_MEMORY_PRESSURE_MONITOR_CHROMEOS_H_