Remove functions_cache_ and it's references as it is not being used anymore.

vm/object_test.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 "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
@@ skipping 92 matching lines @@
   Class& interface = Class::Handle();
   String& interface_name = String::Handle();
   interface_name = Symbols::New("Harley");
   interface = Class::New(interface_name, script, Scanner::kDummyTokenIndex);
   interfaces.SetAt(0, Type::Handle(Type::NewNonParameterizedType(interface)));
   interface_name = Symbols::New("Norton");
   interface = Class::New(interface_name, script, Scanner::kDummyTokenIndex);
   interfaces.SetAt(1, Type::Handle(Type::NewNonParameterizedType(interface)));
   cls.set_interfaces(interfaces);
   cls.Finalize();
-
-  ASSERT(cls.functions_cache() == Array::null());
-  cls.InitFunctionsCache();
-  const Array& array = Array::Handle(cls.functions_cache());
-  array.SetAt(0, function_name);
-  cls.set_functions_cache(array);
-  String& test_name = String::Handle();
-  test_name ^= Array::Handle(cls.functions_cache()).At(0);
-  EXPECT(test_name.Equals(function_name));
 }
 
 
 TEST_CASE(TypeArguments) {
   const Type& type1 = Type::Handle(Type::DoubleInterface());
   const Type& type2 = Type::Handle(Type::StringInterface());
   const TypeArguments& type_arguments1 = TypeArguments::Handle(
     TypeArguments::New(2));
   type_arguments1.SetTypeAt(0, type1);
   type_arguments1.SetTypeAt(1, type2);
@@ skipping 2735 matching lines @@
       "#6      MyClass.foo (dart:test-lib:32:14)\n"
       "#7      MyClass.MyClass.<anonymous closure> (dart:test-lib:21:15)\n"
       "#8      MyClass.MyClass (dart:test-lib:21:18)\n"
       "#9      main.<anonymous closure> (dart:test-lib:37:10)\n"
       "#10     main (dart:test-lib:37:24)");
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart