Update from https://crrev.com/329939

base/memory/memory_pressure_monitor.h

Index: base/memory/memory_pressure_monitor.h
diff --git a/base/memory/memory_pressure_monitor.h b/base/memory/memory_pressure_monitor.h
index 9aeeaca3cdca26f0f1376af981000cfeced6aa5b..50260c4c13bce644df3297737b992cc833d2f870 100644
--- a/base/memory/memory_pressure_monitor.h
+++ b/base/memory/memory_pressure_monitor.h
@@ -20,6 +20,8 @@ class BASE_EXPORT MemoryPressureMonitor {
  public:
   using MemoryPressureLevel = base::MemoryPressureListener::MemoryPressureLevel;
 
+  virtual ~MemoryPressureMonitor();
+
   // Return the singleton MemoryPressureMonitor.
   static MemoryPressureMonitor* Get();
 
@@ -28,7 +30,6 @@ class BASE_EXPORT MemoryPressureMonitor {
 
  protected:
   MemoryPressureMonitor();
-  virtual ~MemoryPressureMonitor();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MemoryPressureMonitor);