Rename OS-specific MemoryPressureMonitor implementations.

base/mac/memory_pressure_monitor.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 BASE_MEMORY_MEMORY_PRESSURE_MONITOR_MAC_H_
-#define BASE_MEMORY_MEMORY_PRESSURE_MONITOR_MAC_H_
+#ifndef BASE_MAC_MEMORY_MEMORY_PRESSURE_MONITOR_H_
+#define BASE_MAC_MEMORY_MEMORY_PRESSURE_MONITOR_H_
 
 #include <dispatch/dispatch.h>
 
 #include "base/base_export.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/memory/memory_pressure_monitor.h"
 
 // The following was added to <dispatch/source.h> after 10.8.
 // TODO(shrike): Remove the DISPATCH_MEMORYPRESSURE_NORMAL ifndef once builders
 // reach 10.9 or higher.
 #ifndef DISPATCH_MEMORYPRESSURE_NORMAL
 
 #define DISPATCH_MEMORYPRESSURE_NORMAL    0x01
 #define DISPATCH_MEMORYPRESSURE_WARN      0x02
 #define DISPATCH_MEMORYPRESSURE_CRITICAL  0x04
 
 #endif  // DISPATCH_MEMORYPRESSURE_NORMAL
 
 namespace base {
+namespace mac {
 
-class TestMemoryPressureMonitorMac;
+class TestMemoryPressureMonitor;
 
 struct DispatchSourceSDeleter {
   void operator()(dispatch_source_s* ptr) {
     dispatch_source_cancel(ptr);
     dispatch_release(ptr);
   }
 };
 
 // Declares the interface for the Mac MemoryPressureMonitor, which reports
 // memory pressure events and status.
-class BASE_EXPORT MemoryPressureMonitorMac : public MemoryPressureMonitor {
+class BASE_EXPORT MemoryPressureMonitor : public MemoryPressureMonitor {
  public:
-  using MemoryPressureLevel = base::MemoryPressureListener::MemoryPressureLevel;
-  MemoryPressureMonitorMac();
-  ~MemoryPressureMonitorMac() override;
+  MemoryPressureMonitor();
+  ~MemoryPressureMonitor() override;
 
   // Returns the currently-observed memory pressure.
   MemoryPressureLevel GetCurrentPressureLevel() const override;
 
  private:
-  friend TestMemoryPressureMonitorMac;
+  friend TestMemoryPressureMonitor;
 
   static MemoryPressureLevel
       MemoryPressureLevelForMacMemoryPressure(int mac_memory_pressure);
   static void NotifyMemoryPressureChanged(dispatch_source_s* event_source);
 
   scoped_ptr<dispatch_source_s, DispatchSourceSDeleter>
       memory_level_event_source_;
 
-  DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitorMac);
+  DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitor);
 };
 
+}  // namespace mac
 }  // namespace base
 
-#endif  // BASE_MEMORY_MEMORY_PRESSURE_MONITOR_MAC_H_
+#endif  // BASE_MAC_MEMORY_MEMORY_PRESSURE_MONITOR_H_