base: Remove DiscardableMemory::CreateLockedMemory.

base/memory/discardable_memory.cc

Index: base/memory/discardable_memory.cc
diff --git a/base/memory/discardable_memory.cc b/base/memory/discardable_memory.cc
index a99c6f8de4be11166c862546e261fec63dd18bbe..d50f1853e197021c8e8e4c0ace7d110f78c52db3 100644
--- a/base/memory/discardable_memory.cc
+++ b/base/memory/discardable_memory.cc
@@ -4,15 +4,12 @@
 
 #include "base/memory/discardable_memory.h"
 
-#include "base/memory/discardable_memory_allocator.h"
-
 namespace base {
 
-// static
-scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemory(
-    size_t size) {
-  return DiscardableMemoryAllocator::GetInstance()
-      ->AllocateLockedDiscardableMemory(size);
+DiscardableMemory::DiscardableMemory() {
+}
+
+DiscardableMemory::~DiscardableMemory() {
 }
 
 }  // namespace base