Convert //base to use std::unique_ptr

base/memory/discardable_memory_allocator.h

Index: base/memory/discardable_memory_allocator.h
diff --git a/base/memory/discardable_memory_allocator.h b/base/memory/discardable_memory_allocator.h
index ea7947e1ccfe003bdd28bb6a4bd56e82bde0e565..ad73f0890d6cbe80b01c763f02c43a305aa3c161 100644
--- a/base/memory/discardable_memory_allocator.h
+++ b/base/memory/discardable_memory_allocator.h
@@ -7,8 +7,9 @@
 
 #include <stddef.h>
 
+#include <memory>
+
 #include "base/base_export.h"
-#include "base/memory/scoped_ptr.h"
 
 namespace base {
 class DiscardableMemory;
@@ -22,7 +23,7 @@ class BASE_EXPORT DiscardableMemoryAllocator {
   // Ownership of |instance| remains with the caller.
   static void SetInstance(DiscardableMemoryAllocator* allocator);
 
-  virtual scoped_ptr<DiscardableMemory> AllocateLockedDiscardableMemory(
+  virtual std::unique_ptr<DiscardableMemory> AllocateLockedDiscardableMemory(
       size_t size) = 0;
 
  protected: