Start using allowed C++11 features.

third_party/base/stl_util.h

Index: third_party/base/stl_util.h
diff --git a/third_party/base/stl_util.h b/third_party/base/stl_util.h
index 50e93415699cb395313b809a95b697016698f16a..32656038c145c2ba33a2c91edbd27afac4d8df09 100644
--- a/third_party/base/stl_util.h
+++ b/third_party/base/stl_util.h
@@ -5,23 +5,8 @@
 #ifndef PDFIUM_THIRD_PARTY_BASE_STL_UTIL_H_
 #define PDFIUM_THIRD_PARTY_BASE_STL_UTIL_H_
 
-#include <vector>
-
 namespace pdfium {
 
-// To treat a possibly-empty vector as an array, use these functions.
-// If you know the array will never be empty, you can use &*v.begin()
-// directly, but that is undefined behaviour if |v| is empty.
-template <typename T>
-inline T* vector_as_array(std::vector<T>* v) {
-  return v->empty() ? nullptr : &*v->begin();
-}
-
-template <typename T>
-inline const T* vector_as_array(const std::vector<T>* v) {
-  return v->empty() ? nullptr : &*v->begin();
-}
-
 // Test to see if a set, map, hash_set or hash_map contains a particular key.
 // Returns true if the key is in the collection.
 template <typename Collection, typename Key>