Remove unused function typedefs.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 0ebe8a0f747846193bfd0002cccd8bec247df4a0..253d5283bc9f22c2e4a1021c8eecb4b5ae0fb20f 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -536,35 +536,6 @@ class ThreadLocalTop;
 // Mark-Compact collector
 class MarkCompactCollector {
  public:
-  // Type of functions to compute forwarding addresses of objects in
-  // compacted spaces.  Given an object and its size, return a (non-failure)
-  // Object* that will be the object after forwarding.  There is a separate
-  // allocation function for each (compactable) space based on the location
-  // of the object before compaction.
-  typedef MaybeObject* (*AllocationFunction)(Heap* heap,
-                                             HeapObject* object,
-                                             int object_size);
-
-  // Type of functions to encode the forwarding address for an object.
-  // Given the object, its size, and the new (non-failure) object it will be
-  // forwarded to, encode the forwarding address.  For paged spaces, the
-  // 'offset' input/output parameter contains the offset of the forwarded
-  // object from the forwarding address of the previous live object in the
-  // page as input, and is updated to contain the offset to be used for the
-  // next live object in the same page.  For spaces using a different
-  // encoding (i.e., contiguous spaces), the offset parameter is ignored.
-  typedef void (*EncodingFunction)(Heap* heap,
-                                   HeapObject* old_object,
-                                   int object_size,
-                                   Object* new_object,
-                                   int* offset);
-
-  // Type of functions to process non-live objects.
-  typedef void (*ProcessNonLiveFunction)(HeapObject* object, Isolate* isolate);
-
-  // Pointer to member function, used in IterateLiveObjects.
-  typedef int (MarkCompactCollector::*LiveObjectCallback)(HeapObject* obj);
-
   // Set the global flags, it must be called before Prepare to take effect.
   inline void SetFlags(int flags);