Remove std::mem_fun uses.

chrome/browser/browsing_data/cookies_tree_model.cc

Index: chrome/browser/browsing_data/cookies_tree_model.cc
diff --git a/chrome/browser/browsing_data/cookies_tree_model.cc b/chrome/browser/browsing_data/cookies_tree_model.cc
index 1f4cfd3d58d900bebd641e61800b54851de6490f..79befceef3ea7816288c5b2ecc1d1c8ea785e70f 100644
--- a/chrome/browser/browsing_data/cookies_tree_model.cc
+++ b/chrome/browser/browsing_data/cookies_tree_model.cc
@@ -290,9 +290,8 @@ CookieTreeNode::DetailedInfo& CookieTreeNode::DetailedInfo::InitFlashLSO(
 // CookieTreeNode, public:
 
 void CookieTreeNode::DeleteStoredObjects() {
-  std::for_each(children().begin(),
-                children().end(),
-                std::mem_fun(&CookieTreeNode::DeleteStoredObjects));
+  for (auto* child : children())
+    child->DeleteStoredObjects();
 }
 
 CookiesTreeModel* CookieTreeNode::GetModel() const {