Switch WebContentsUserData to be a friended base.

chrome/browser/tab_contents/web_contents_user_data_unittest.cc

 // Copyright (c) 2012 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 "chrome/browser/tab_contents/web_contents_user_data.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/web_contents_tester.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 class WebContentsAttachedClass1
     : public WebContentsUserData<WebContentsAttachedClass1> {
  public:
+  virtual ~WebContentsAttachedClass1() {}
+ private:
   explicit WebContentsAttachedClass1(content::WebContents* contents) {}
-  virtual ~WebContentsAttachedClass1() {}
   static int kUserDataKey;
+  friend class WebContentsUserData<WebContentsAttachedClass1>;
 };
 
 class WebContentsAttachedClass2
     : public WebContentsUserData<WebContentsAttachedClass2> {
  public:
+  virtual ~WebContentsAttachedClass2() {}
+ private:
   explicit WebContentsAttachedClass2(content::WebContents* contents) {}
-  virtual ~WebContentsAttachedClass2() {}
   static int kUserDataKey;
+  friend class WebContentsUserData<WebContentsAttachedClass2>;
 };
 
 int WebContentsAttachedClass1::kUserDataKey;
 int WebContentsAttachedClass2::kUserDataKey;
 
 }  // namespace
 
 typedef ChromeRenderViewHostTestHarness WebContentsUserDataTest;
 
 TEST_F(WebContentsUserDataTest, OneInstanceTwoAttachments) {
@@ skipping 58 matching lines @@
   WebContentsAttachedClass1::CreateForWebContents(contents);
   clazz = WebContentsAttachedClass1::FromWebContents(contents);
   ASSERT_TRUE(clazz != NULL);
 
   WebContentsAttachedClass1::CreateForWebContents(contents);
   WebContentsAttachedClass1* class_again =
       WebContentsAttachedClass1::FromWebContents(contents);
   ASSERT_TRUE(class_again != NULL);
   ASSERT_EQ(clazz, class_again);
 }