Remove unused variable.

runtime/vm/dart_entry_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/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/object.h"
@@ skipping 75 matching lines @@
   EXPECT(ClassFinalizer::FinalizePendingClasses());
   Class& cls = Class::Handle(
       lib.LookupClass(String::Handle(String::NewSymbol("A"))));
   EXPECT(!cls.IsNull());
 
   // Invoke the constructor.
   const Instance& instance = Instance::Handle(Instance::New(cls));
   GrowableArray<const Object*> constructor_arguments(2);
   constructor_arguments.Add(&instance);
   constructor_arguments.Add(&Smi::Handle(Smi::New(Function::kCtorPhaseAll)));
-  const String& period = String::Handle(String::New("."));
   String& constructor_name = String::Handle(String::NewSymbol("A."));
   Function& constructor =
       Function::Handle(cls.LookupConstructor(constructor_name));
   ASSERT(!constructor.IsNull());
   const Array& kNoArgumentNames = Array::Handle();
   DartEntry::InvokeStatic(constructor, constructor_arguments, kNoArgumentNames);
 
   // Call foo.
   String& name = String::Handle(String::New("foo"));
   Function& function = Function::Handle(cls.LookupDynamicFunction(name));
   EXPECT(!function.IsNull());
   GrowableArray<const Object*> arguments;
   const Object& retval = Object::Handle(
       DartEntry::InvokeDynamic(
           instance, function, arguments, kNoArgumentNames));
   EXPECT(retval.IsError());
   Error& error = Error::Handle();
   error ^= retval.raw();
   EXPECT_SUBSTRING("++++", error.ToErrorCString());
 }
 
 #endif  // TARGET_ARCH_IA32 || TARGET_ARCH_X64.
 
 }  // namespace dart