Remove RefCountedMallocedMemory, it's not used.

base/memory/ref_counted_memory.h

Index: base/memory/ref_counted_memory.h
diff --git a/base/memory/ref_counted_memory.h b/base/memory/ref_counted_memory.h
index 2b0dae5ddf792dcb809495364423e990fca5b8b3..0372c87f85c3872fdd5bf0bfb127353a5aa3a0b7 100644
--- a/base/memory/ref_counted_memory.h
+++ b/base/memory/ref_counted_memory.h
@@ -124,26 +124,6 @@ class BASE_EXPORT RefCountedString : public RefCountedMemory {
   DISALLOW_COPY_AND_ASSIGN(RefCountedString);
 };
 
-// An implementation of RefCountedMemory that holds a chunk of memory
-// previously allocated with malloc or calloc, and that therefore must be freed
-// using free().
-class BASE_EXPORT RefCountedMallocedMemory : public base::RefCountedMemory {
- public:
-  RefCountedMallocedMemory(void* data, size_t length);
-
-  // Overridden from RefCountedMemory:
-  const unsigned char* front() const override;
-  size_t size() const override;
-
- private:
-  ~RefCountedMallocedMemory() override;
-
-  unsigned char* data_;
-  size_t length_;
-
-  DISALLOW_COPY_AND_ASSIGN(RefCountedMallocedMemory);
-};
-
 }  // namespace base
 
 #endif  // BASE_MEMORY_REF_COUNTED_MEMORY_H_