Changes to get rid of dependency on openssl in the dart VM.

vm/isolate.h

Index: vm/isolate.h
===================================================================
--- vm/isolate.h	(revision 4707)
+++ vm/isolate.h	(working copy)
@@ -15,7 +15,6 @@
 
 // Forward declarations.
 class ApiState;
-class BigintStore;
 class CodeIndexTable;
 class Debugger;
 class HandleScope;
@@ -119,9 +118,6 @@
     return OFFSET_OF(Isolate, current_zone_);
   }
 
-  BigintStore* bigint_store() const { return bigint_store_; }
-  void set_bigint_store(BigintStore* store) { bigint_store_ = store; }
-
   int32_t no_gc_scope_depth() const {
 #if defined(DEBUG)
     return no_gc_scope_depth_;
@@ -263,7 +259,6 @@
   HandleScope* top_handle_scope_;
 #endif
   int32_t random_seed_;
-  BigintStore* bigint_store_;
   uword top_exit_frame_info_;
   void* init_callback_data_;
   Dart_LibraryTagHandler library_tag_handler_;