cc: Make the ScopedPtrVector and ScopedPtrDeque containers act like STL vector and deque.

cc/scoped_ptr_algorithm.h

Index: cc/scoped_ptr_algorithm.h
diff --git a/cc/scoped_ptr_algorithm.h b/cc/scoped_ptr_algorithm.h
new file mode 100644
index 0000000000000000000000000000000000000000..2972b00b0717b82c5ea85b12fdaaf0a72ce4d18a
--- /dev/null
+++ b/cc/scoped_ptr_algorithm.h
@@ -0,0 +1,30 @@
+// Copyright 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.
+
+#ifndef CC_SCOPED_PTR_ALGORITHM_H_
+#define CC_SCOPED_PTR_ALGORITHM_H_
+
+namespace cc {
+
+// ScopedContainers need to implement a swap() method since they do not allow
+// assignment to their iterators.
+template <class ForwardIterator, class Predicate, class ScopedContainer>
+ForwardIterator remove_if(
+    ScopedContainer& container,
+    ForwardIterator first,
+    ForwardIterator last,
+    Predicate predicate) {
+  ForwardIterator result = first;
+  for (; first != last; ++first) {
+    if (!predicate(*first)) {
+      container.swap(first, result);
+      ++result;
+    }
+  }
+  return result;
+}
+
+}  // namespace cc
+
+#endif  // CC_SCOPED_PTR_ALGORITHM_H_