Revert "Updated MallocHooks to collect stack traces when memory is allocated."

runtime/vm/malloc_hooks_unsupported.cc

Index: runtime/vm/malloc_hooks_unsupported.cc
diff --git a/runtime/vm/malloc_hooks_unsupported.cc b/runtime/vm/malloc_hooks_unsupported.cc
index 1f8b75a45ddfca65d2123a0469db91b96d5d05b5..733e3ded74efdad658a44870dfedb9d540701805 100644
--- a/runtime/vm/malloc_hooks_unsupported.cc
+++ b/runtime/vm/malloc_hooks_unsupported.cc
@@ -4,8 +4,7 @@
 
 #include "platform/globals.h"
 
-#if !defined(DART_USE_TCMALLOC) || defined(PRODUCT) ||                         \
-    defined(TARGET_ARCH_DBC) || defined(TARGET_OS_FUCHSIA)
+#if !defined(DART_USE_TCMALLOC) || defined(PRODUCT)
 
 #include "vm/malloc_hooks.h"
 
@@ -21,21 +20,6 @@ void MallocHooks::TearDown() {
 }
 
 
-bool MallocHooks::ProfilingEnabled() {
-  return false;
-}
-
-
-bool MallocHooks::stack_trace_collection_enabled() {
-  return false;
-}
-
-
-void MallocHooks::set_stack_trace_collection_enabled(bool enabled) {
-  // Do nothing.
-}
-
-
 void MallocHooks::ResetStats() {
   // Do nothing.
 }
@@ -62,5 +46,4 @@ intptr_t MallocHooks::heap_allocated_memory_in_bytes() {
 
 }  // namespace dart
 
-#endif  // !defined(DART_USE_TCMALLOC) || defined(PRODUCT) ||
-        // defined(TARGET_ARCH_DBC) || defined(TARGET_OS_FUCHSIA)
+#endif  // defined(DART_USE_TCMALLOC) || defined(PRODUCT)