Allow icomplete types in scoped_refptr<T>.

base/test/opaque_ref_counted.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/test/opaque_ref_counted.h"
 
 #include "base/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
@@ skipping 36 matching lines @@
 scoped_refptr<OpaqueRefCountedThreadSafe> MakeOpaqueRefCountedThreadSafe() {
   return new OpaqueRefCountedThreadSafe();
 }
 
 void TestOpaqueRefCountedThreadSafe(
     scoped_refptr<OpaqueRefCountedThreadSafe> p) {
   EXPECT_EQ(42, p->Return42());
 }
 
 }  // namespace base
-
-template class scoped_refptr<base::OpaqueRefCounted>;
-template class scoped_refptr<base::OpaqueRefCountedThreadSafe>;