Remove references to dlmalloc specific functions

Remove references to internal libc dlmalloc_* functions
so that we can hide them for lp64

Change-Id: I13977bea63d900e1819052140e3bd6bc1f2fc759
diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index 51f57c3..d5cf07e 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -4756,12 +4756,7 @@
   // Send a series of heap segment chunks.
   HeapChunkContext context(what == HPSG_WHAT_MERGED_OBJECTS, native);
   if (native) {
-#if defined(__ANDROID__) && defined(USE_DLMALLOC)
-    dlmalloc_inspect_all(HeapChunkContext::HeapChunkNativeCallback, &context);
-    HeapChunkContext::HeapChunkNativeCallback(nullptr, nullptr, 0, &context);  // Indicate end of a space.
-#else
-    UNIMPLEMENTED(WARNING) << "Native heap inspection is only supported with dlmalloc";
-#endif
+    UNIMPLEMENTED(WARNING) << "Native heap inspection is not supported";
   } else {
     gc::Heap* heap = Runtime::Current()->GetHeap();
     for (const auto& space : heap->GetContinuousSpaces()) {