Revert 244229 "base: Fix registering of memory pressure listener..."

trunk/src/base/memory/discardable_memory_provider.h

Index: trunk/src/base/memory/discardable_memory_provider.h
===================================================================
--- trunk/src/base/memory/discardable_memory_provider.h	(revision 244277)
+++ trunk/src/base/memory/discardable_memory_provider.h	(working copy)
@@ -46,13 +46,6 @@
   DiscardableMemoryProvider();
   ~DiscardableMemoryProvider();
 
-  // Call this to register memory pressure listener. Must be called on a
-  // thread with a MessageLoop current.
-  void RegisterMemoryPressureListener();
-
-  // Call this to unregister memory pressure listener.
-  void UnregisterMemoryPressureListener();
-
   // The maximum number of bytes of discardable memory that may be allocated
   // before we force a purge. If this amount is zero, it is interpreted as
   // having no limit at all.
@@ -106,7 +99,7 @@
   typedef HashingMRUCache<const DiscardableMemory*, Allocation> AllocationMap;
 
   // This can be called as a hint that the system is under memory pressure.
-  void OnMemoryPressure(
+  void NotifyMemoryPressure(
       MemoryPressureListener::MemoryPressureLevel pressure_level);
 
   // Purges |bytes_to_reclaim_under_moderate_pressure_| bytes of
@@ -139,7 +132,7 @@
 
   // Allows us to be respond when the system reports that it is under memory
   // pressure.
-  scoped_ptr<MemoryPressureListener> memory_pressure_listener_;
+  MemoryPressureListener memory_pressure_listener_;
 
   DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryProvider);
 };