Replace linked list of loaded libraries

runtime/vm/debugger.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/debugger.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 707 matching lines @@
       const Function& target_function) {
   ASSERT(!target_function.IsNull());
   return SetBreakpoint(target_function, target_function.token_index());
 }
 
 
 SourceBreakpoint* Debugger::SetBreakpointAtLine(const String& script_url,
                                           intptr_t line_number) {
   Library& lib = Library::Handle();
   Script& script = Script::Handle();
-  lib = isolate_->object_store()->registered_libraries();
-  while (!lib.IsNull()) {
+  const GrowableObjectArray& libs =
+      GrowableObjectArray::Handle(isolate_->object_store()->libraries());
+  for (int i = 0; i < libs.Length(); i++) {
+    lib ^= libs.At(i);
     script = lib.LookupScript(script_url);
     if (!script.IsNull()) {
       break;
     }
-    lib = lib.next_registered();
   }
   if (script.IsNull()) {
     if (verbose) {
       OS::Print("Failed to find script with url '%s'\n",
                 script_url.ToCString());
     }
     return NULL;
   }
   intptr_t token_index_at_line = script.TokenIndexAtLine(line_number);
   if (token_index_at_line < 0) {
@@ skipping 451 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart