Prevent URLFetcher::AppendChunkedData from dereferencing NULL pointers.

chrome/browser/profiles/profile_browsertest.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/profiles/profile.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
@@ skipping 509 matching lines @@
   StartActiveFetcherDuringProfileShutdownTest(
       browser()->profile()->GetRequestContext());
 }
 
 IN_PROC_BROWSER_TEST_F(ProfileBrowserTest,
                        URLFetcherUsingMediaContextDuringShutdown) {
   StartActiveFetcherDuringProfileShutdownTest(
       browser()->profile()->GetMediaRequestContext());
 }
 
-IN_PROC_BROWSER_TEST_F(ProfileBrowserTest,

[eroman, 2016/03/26 00:55:16]

Why the removals?

[mmenke, 2016/03/28 17:33:11]

git meltdown...These are from another CL...Grr.  Removed from this CL.  Too easy
to commit to master instead of a branch, and then once you pull from master,
even if you fix master, you still have the leftovers.  :(

-                       URLFetcherUsingExtensionContextDuringShutdown) {
-  StartActiveFetcherDuringProfileShutdownTest(
-      browser()->profile()->GetRequestContextForExtensions());
-}
-
 // The following tests make sure that it's safe to destroy an incognito profile
 // while one of the its URLRequestContextGetters is in use by a URLFetcher.
 
 IN_PROC_BROWSER_TEST_F(ProfileBrowserTest,
                        URLFetcherUsingMainContextDuringIncognitoTeardown) {
   Browser* incognito_browser =
       OpenURLOffTheRecord(browser()->profile(), GURL("about:blank"));
   RunURLFetcherActiveDuringIncognitoTeardownTest(
       incognito_browser, incognito_browser->profile()->GetRequestContext());
 }
-
-IN_PROC_BROWSER_TEST_F(ProfileBrowserTest,
-                       URLFetcherUsingExtensionContextDuringIncognitoTeardown) {
-  Browser* incognito_browser =
-      OpenURLOffTheRecord(browser()->profile(), GURL("about:blank"));
-
-  RunURLFetcherActiveDuringIncognitoTeardownTest(
-      incognito_browser,
-      incognito_browser->profile()->GetRequestContextForExtensions());
-}