Remove stl_util's STLDeleteContainerPointers.

BUG=555865

Review-Url: https://codereview.chromium.org/2457343002
Cr-Commit-Position: refs/heads/master@{#429152}

PRESUBMIT.py

@@ -314,15 +314,6 @@ _BANNED_CPP_FUNCTIONS = (
       True,
       (),
     ),
-    (
-      r'STLDeleteContainerPointers',  # http://crbug.com/555865
-      (
-        'This call is obsolete with C++ 11; create a container with owning',
-        'pointers instead (e.g. std::vector<std::unique_ptr<x>> ).',
-      ),
-      True,
-      (),
-    ),
     (
       r'STLDeleteElements',  # http://crbug.com/555865
       (

base/containers/scoped_ptr_hash_map.h

@@ -128,9 +128,9 @@ class ScopedPtrHashMap {
   inline void clear() {
     auto it = data_.begin();
     while (it != data_.end()) {
-      // NOTE: Like STLDeleteContainerPointers, deleting behind the iterator.
-      // Deleting the value does not always invalidate the iterator, but it may
-      // do so if the key is a pointer into the value object.
+      // NOTE: Deleting behind the iterator. Deleting the value does not always
+      // invalidate the iterator, but it may do so if the key is a pointer into
+      // the value object.
       auto temp = it;
       ++it;
       // Let ScopedPtr decide how to delete.

base/stl_util.h

@@ -29,24 +29,6 @@ void STLClearObject(T* obj) {
   obj->reserve(0);
 }
 
-// For a range within a container of pointers, calls delete (non-array version)
-// on these pointers.
-// NOTE: for these three functions, we could just implement a DeleteObject
-// functor and then call for_each() on the range and functor, but this
-// requires us to pull in all of algorithm.h, which seems expensive.
-// For hash_[multi]set, it is important that this deletes behind the iterator
-// because the hash_set may call the hash function on the iterator when it is
-// advanced, which could result in the hash function trying to deference a
-// stale pointer.
-template <class ForwardIterator>
-void STLDeleteContainerPointers(ForwardIterator begin, ForwardIterator end) {
-  while (begin != end) {
-    ForwardIterator temp = begin;
-    ++begin;
-    delete *temp;
-  }
-}
-
 // Counts the number of instances of val in a container.
 template <typename Container, typename T>
 typename std::iterator_traits<
@@ -85,7 +67,13 @@ template <class T>
 void STLDeleteElements(T* container) {
   if (!container)
     return;
-  STLDeleteContainerPointers(container->begin(), container->end());
+
+  for (auto it = container->begin(); it != container->end();) {
+    auto temp = it;
+    ++it;
+    delete *temp;
+  }
+
   container->clear();
 }
 
@@ -97,8 +85,7 @@ void STLDeleteValues(T* container) {
   if (!container)
     return;
 
-  auto it = container->begin();
-  while (it != container->end()) {
+  for (auto it = container->begin(); it != container->end();) {
     auto temp = it;
     ++it;
     delete temp->second;