[vm, mirrors] Remove Dartium's dart:io hack.

runtime/lib/mirrors.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 "lib/mirrors.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
@@ skipping 339 matching lines @@
   str = lib.url();
   const char* censored_libraries[] = {
       "dart:_builtin", "dart:_blink", "dart:_vmservice", NULL,
   };
   for (intptr_t i = 0; censored_libraries[i] != NULL; i++) {
     if (str.Equals(censored_libraries[i])) {
       // Censored library (grumble).
       return Instance::null();
     }
   }
-  if (str.Equals("dart:io")) {
-    // Hack around dart:io being loaded into non-service isolates in Dartium.
-    Isolate* isolate = thread->isolate();
-    const GrowableObjectArray& libraries =
-        GrowableObjectArray::Handle(zone, isolate->object_store()->libraries());
-    Library& other_lib = Library::Handle(zone);
-    String& other_uri = String::Handle(zone);
-    for (intptr_t i = 0; i < libraries.Length(); i++) {
-      other_lib ^= libraries.At(i);
-      other_uri = other_lib.url();
-      if (other_uri.Equals("dart:html")) {
-        return Instance::null();
-      }
-    }
-  }
   args.SetAt(2, str);
   return CreateMirror(Symbols::_LocalLibraryMirror(), args);
 }
 
 static RawInstance* CreateCombinatorMirror(const Object& identifiers,
                                            bool is_show) {
   const Array& args = Array::Handle(Array::New(2));
   args.SetAt(0, identifiers);
   args.SetAt(1, Bool::Get(is_show));
   return CreateMirror(Symbols::_LocalCombinatorMirror(), args);
@@ skipping 1657 matching lines @@
 
 DEFINE_NATIVE_ENTRY(TypeMirror_subtypeTest, 2) {
   GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, a, arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, b, arguments->NativeArgAt(1));
   return Bool::Get(a.IsSubtypeOf(b, NULL, NULL, Heap::kNew)).raw();
 }
 
 #endif  // !DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart