Revert "Add dart:collection_dev library."

runtime/vm/object_store.h

Index: runtime/vm/object_store.h
diff --git a/runtime/vm/object_store.h b/runtime/vm/object_store.h
index bf980646691e459f35543f287a1f35977fb11975..97c822132c657d319b3517dbaa13cd6ea11f0256 100644
--- a/runtime/vm/object_store.h
+++ b/runtime/vm/object_store.h
@@ -377,13 +377,6 @@ class ObjectStore {
     collection_library_ = value.raw();
   }
 
-  RawLibrary* collection_dev_library() const {
-    return collection_dev_library_;
-  }
-  void set_collection_dev_library(const Library& value) {
-    collection_dev_library_ = value.raw();
-  }
-
   RawLibrary* math_library() const {
     return math_library_;
   }
@@ -571,7 +564,6 @@ class ObjectStore {
   RawLibrary* core_library_;
   RawLibrary* core_impl_library_;
   RawLibrary* collection_library_;
-  RawLibrary* collection_dev_library_;
   RawLibrary* math_library_;
   RawLibrary* isolate_library_;
   RawLibrary* mirrors_library_;