Remove some uses of stl_util's STLDeleteContainerPointers.

ui/views/controls/textfield/textfield_model.h

Index: ui/views/controls/textfield/textfield_model.h
diff --git a/ui/views/controls/textfield/textfield_model.h b/ui/views/controls/textfield/textfield_model.h
index c66fe6d068083ee7047790207da919042160e663..58fdca3586d7bae1efce19b9ddd9bc08ba6450a6 100644
--- a/ui/views/controls/textfield/textfield_model.h
+++ b/ui/views/controls/textfield/textfield_model.h
@@ -265,9 +265,10 @@ class VIEWS_EXPORT TextfieldModel {
                                size_t new_text_start);
   void ExecuteAndRecordInsert(const base::string16& new_text, bool mergeable);
 
-  // Adds or merge |edit| into edit history. Return true if the edit
-  // has been merged and must be deleted after redo.
-  bool AddOrMergeEditHistory(internal::Edit* edit);
+  // Adds or merge |edit| into edit history. Return ownership of the edit if the
+  // edit has been merged and must be deleted after redo.
+  std::unique_ptr<internal::Edit> AddOrMergeEditHistory(
+      std::unique_ptr<internal::Edit> edit);
 
   // Modify the text buffer in following way:
   // 1) Delete the string from |delete_from| to |delte_to|.
@@ -294,7 +295,7 @@ class VIEWS_EXPORT TextfieldModel {
   // The composition range.
   gfx::Range composition_range_;
 
-  typedef std::list<internal::Edit*> EditHistory;
+  typedef std::list<std::unique_ptr<internal::Edit>> EditHistory;
   EditHistory edit_history_;
 
   // An iterator that points to the current edit that can be undone.