Kill all URLFetcher URLRequests on shutdown.

BUG=59630
TEST=none

Review URL: http://codereview.chromium.org/3826016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@63463 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 0861eb4..990f9a4 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -263,6 +263,9 @@
   net::ShutdownOCSP();
 #endif  // defined(USE_NSS)
 
+  // Destroy all URLRequests started by URLFetchers.
+  URLFetcher::CancelAll();
+
   // This must be reset before the ChromeNetLog is destroyed.
   network_change_observer_.reset();