Remove base's implicit_cast.

base/memory/scoped_ptr.h

Index: base/memory/scoped_ptr.h
diff --git a/base/memory/scoped_ptr.h b/base/memory/scoped_ptr.h
index 987ccfa804eadde2f89b1ac904ee77bd47b16d36..874bcb5c257d3a03e95b6d1bfba1158793c343af 100644
--- a/base/memory/scoped_ptr.h
+++ b/base/memory/scoped_ptr.h
@@ -465,9 +465,9 @@ class scoped_ptr<T[], D> {
   //   (C++98 [expr.delete]p3). If you're doing this, fix your code.
   // - it cannot be const-qualified differently from T per unique_ptr spec
   //   (http://cplusplus.github.com/LWG/lwg-active.html#2118). Users wanting
-  //   to work around this may use implicit_cast<const T*>().
+  //   to work around this may use const_cast<const T*>().
   //   However, because of the first bullet in this comment, users MUST
-  //   NOT use implicit_cast<Base*>() to upcast the static type of the array.
+  //   NOT use const_cast<Base*>() to upcast the static type of the array.

[Adam Rice, 2015/09/14 05:30:29]

While it's technically true that you MUST NOT use const_cast<Base*>() to upcast
the static type of the array, it's a little bit irrelevant because it won't
compile.

I think because this sentence is meaningless now it would probably be best just
to remove it.

[danakj, 2015/09/14 18:02:35]

Right.. yah okay. Done, thanks for looking.

   explicit scoped_ptr(element_type* array) : impl_(array) {}
 
   // Constructor.  Allows construction from a nullptr.