Fix name of libraries without a library declaration to be the empty string.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 7047 matching lines @@
   RawObject* raw = Object::Allocate(Library::kClassId,
                                     Library::InstanceSize(),
                                     Heap::kOld);
   return reinterpret_cast<RawLibrary*>(raw);
 }
 
 
 RawLibrary* Library::NewLibraryHelper(const String& url,
                                       bool import_core_lib) {
   const Library& result = Library::Handle(Library::New());
-  result.StorePointer(&result.raw_ptr()->name_, url.raw());
+  result.StorePointer(&result.raw_ptr()->name_, Symbols::Empty().raw());
   result.StorePointer(&result.raw_ptr()->url_, url.raw());
   result.raw_ptr()->private_key_ = Scanner::AllocatePrivateKey(result);
   result.raw_ptr()->dictionary_ = Object::empty_array().raw();
   result.StorePointer(&result.raw_ptr()->metadata_,
                       GrowableObjectArray::New(4, Heap::kOld));
   result.raw_ptr()->anonymous_classes_ = Object::empty_array().raw();
   result.raw_ptr()->num_anonymous_ = 0;
   result.raw_ptr()->imports_ = Object::empty_array().raw();
   result.raw_ptr()->exports_ = Object::empty_array().raw();
   result.raw_ptr()->loaded_scripts_ = Array::null();
@@ skipping 7507 matching lines @@
 }
 
 
 void MirrorReference::PrintToJSONStream(JSONStream* stream, bool ref) const {
   stream->OpenObject();
   stream->CloseObject();
 }
 
 
 }  // namespace dart