Revert [heap.py] Add missing declaration for malloc_get_all_zones

This reverts r369684 (git commit cc62e38d258f414c196b566374c606e83a85a034)

Adding a declaration doesn't appear to be a sufficient fix.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@369706 91177308-0d34-0410-b5e6-96231b3b80d8

Author: vedantk

examples/darwin/heap_find/heap.py

@@ -129,7 +129,6 @@ def get_iterate_memory_expr(
     void *reserved1[12];
     struct malloc_introspection_t	*introspect;
 } malloc_zone_t;
-kern_return_t malloc_get_all_zones(task_t task, memory_reader_t reader, vm_address_t **addresses, unsigned *count);
 memory_reader_t task_peek = [](task_t task, vm_address_t remote_address, vm_size_t size, void **local_memory) -> kern_return_t {
     *local_memory = (void*) remote_address;
     return KERN_SUCCESS;