content: Remove non-thread-safe use of WeakPtrs.

content/child/child_discardable_shared_memory_manager.h

Index: content/child/child_discardable_shared_memory_manager.h
diff --git a/content/child/child_discardable_shared_memory_manager.h b/content/child/child_discardable_shared_memory_manager.h
index 3dee17397ffdebd08cf1bae055a2b93f58ca2b19..881b59ec1dfe69a179af749bccb9e963faf4148c 100644
--- a/content/child/child_discardable_shared_memory_manager.h
+++ b/content/child/child_discardable_shared_memory_manager.h
@@ -7,7 +7,6 @@
 
 #include "base/memory/discardable_memory_allocator.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "content/child/thread_safe_sender.h"
 #include "content/common/content_export.h"
@@ -39,14 +38,12 @@ class CONTENT_EXPORT ChildDiscardableSharedMemoryManager
   scoped_ptr<base::DiscardableSharedMemory>
   AllocateLockedDiscardableSharedMemory(size_t size,
                                         DiscardableSharedMemoryId id);
-  void DeletedDiscardableSharedMemory(DiscardableSharedMemoryId id);
   void MemoryUsageChanged(size_t new_bytes_allocated,
                           size_t new_bytes_free) const;
 
   mutable base::Lock lock_;
   DiscardableSharedMemoryHeap heap_;
   scoped_refptr<ThreadSafeSender> sender_;
-  base::WeakPtrFactory<ChildDiscardableSharedMemoryManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildDiscardableSharedMemoryManager);
 };