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

trunk/src/base/memory/discardable_memory.h

Index: trunk/src/base/memory/discardable_memory.h
===================================================================
--- trunk/src/base/memory/discardable_memory.h	(revision 244277)
+++ trunk/src/base/memory/discardable_memory.h	(working copy)
@@ -63,14 +63,6 @@
  public:
   virtual ~DiscardableMemory() {}
 
-  // Call this on a thread with a MessageLoop current to allow discardable
-  // memory implementations to respond to memory pressure signals.
-  static void RegisterMemoryPressureListeners();
-
-  // Call this to prevent discardable memory implementations from responding
-  // to memory pressure signals.
-  static void UnregisterMemoryPressureListeners();
-
   // Gets the discardable memory type with a given name.
   static DiscardableMemoryType GetNamedType(const std::string& name);