Remove RefCountedMallocedMemory, it's not used.

Review URL: https://codereview.chromium.org/1550963002

Cr-Commit-Position: refs/heads/master@{#367114}

base/memory/ref_counted_memory.cc

@@ -4,8 +4,6 @@
 
 #include "base/memory/ref_counted_memory.h"
 
-#include <stdlib.h>
-
 #include "base/logging.h"
 
 namespace base {
@@ -79,22 +77,4 @@ size_t RefCountedString::size() const {
   return data_.size();
 }
 
-RefCountedMallocedMemory::RefCountedMallocedMemory(
-    void* data, size_t length)
-    : data_(reinterpret_cast<unsigned char*>(data)), length_(length) {
-  DCHECK(data || length == 0);
-}
-
-const unsigned char* RefCountedMallocedMemory::front() const {
-  return length_ ? data_ : NULL;
-}
-
-size_t RefCountedMallocedMemory::size() const {
-  return length_;
-}
-
-RefCountedMallocedMemory::~RefCountedMallocedMemory() {
-  free(data_);
-}
-
 }  //  namespace base

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_

base/memory/ref_counted_memory_unittest.cc

@@ -52,16 +52,6 @@ TEST(RefCountedMemoryUnitTest, RefCountedString) {
   EXPECT_EQ('e', mem->front()[1]);
 }
 
-TEST(RefCountedMemoryUnitTest, RefCountedMallocedMemory) {
-  void* data = malloc(6);
-  memcpy(data, "hello", 6);
-
-  scoped_refptr<RefCountedMemory> mem = new RefCountedMallocedMemory(data, 6);
-
-  EXPECT_EQ(6U, mem->size());
-  EXPECT_EQ(0, memcmp("hello", mem->front(), 6));
-}
-
 TEST(RefCountedMemoryUnitTest, Equals) {
   std::string s1("same");
   scoped_refptr<RefCountedMemory> mem1 = RefCountedString::TakeString(&s1);