Get rid of support for string interpolation in #import strings.

vm/object_store.cc

 // Copyright (c) 2011, 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_store.h"
 
 #include "vm/exceptions.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/raw_object.h"
@@ skipping 54 matching lines @@
     canonical_type_arguments_(Array::null()),
     core_library_(Library::null()),
     core_impl_library_(Library::null()),
     math_library_(Library::null()),
     isolate_library_(Library::null()),
     mirrors_library_(Library::null()),
     native_wrappers_library_(Library::null()),
     builtin_library_(Library::null()),
     root_library_(Library::null()),
     libraries_(GrowableObjectArray::null()),
-    import_map_(Array::null()),
     pending_classes_(GrowableObjectArray::null()),
     sticky_error_(Error::null()),
     empty_context_(Context::null()),
     stack_overflow_(Instance::null()),
     out_of_memory_(Instance::null()),
     keyword_symbols_(Array::null()) {
 }
 
 
 ObjectStore::~ObjectStore() {
@@ skipping 43 matching lines @@
 void ObjectStore::InitKeywordTable() {
   // Set up the keywords symbol array so that we can access it while scanning.
   Array& keywords = Array::Handle(keyword_symbols());
   ASSERT(keywords.IsNull());
   keywords = Array::New(Token::numKeywords, Heap::kOld);
   ASSERT(!keywords.IsError() && !keywords.IsNull());
   set_keyword_symbols(keywords);
 }
 
 }  // namespace dart