- Ensure that BaseIsolate is only used to break the header include cycles.

runtime/vm/handles.cc

Index: runtime/vm/handles.cc
===================================================================
--- runtime/vm/handles.cc	(revision 35767)
+++ runtime/vm/handles.cc	(working copy)
@@ -80,7 +80,7 @@
 }
 
 
-HandleScope::HandleScope(BaseIsolate* isolate) : StackResource(isolate) {
+HandleScope::HandleScope(Isolate* isolate) : StackResource(isolate) {
   ASSERT(isolate->no_handle_scope_depth() == 0);
   VMHandles* handles = isolate->current_zone()->handles();
   ASSERT(handles != NULL);
@@ -109,7 +109,7 @@
 
 
 #if defined(DEBUG)
-NoHandleScope::NoHandleScope(BaseIsolate* isolate) : StackResource(isolate) {
+NoHandleScope::NoHandleScope(Isolate* isolate) : StackResource(isolate) {
   isolate->IncrementNoHandleScopeDepth();
 }