Use validating form of IPC enum macros for clipboard messages.

This is part of a long-running background task to remove the remaining
uses of the unchecked IPC_ENUM_TRAITS() macro.

BUG=246708

Review URL: https://codereview.chromium.org/159363002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250326 0039d316-1c4b-4281-b951-d872f2087c98

content/common/clipboard_messages.h

@@ -32,7 +32,7 @@ struct ParamTraits<ui::Clipboard::FormatType> {
 
 #endif  // CONTENT_COMMON_CLIPBOARD_MESSAGES_H_
 
-IPC_ENUM_TRAITS(ui::ClipboardType)
+IPC_ENUM_TRAITS_MAX_VALUE(ui::ClipboardType, ui::CLIPBOARD_TYPE_LAST)
 
 // Clipboard IPC messages sent from the renderer to the browser.
 

ui/base/clipboard/clipboard_types.h

@@ -13,7 +13,8 @@ namespace ui {
 enum ClipboardType {
   CLIPBOARD_TYPE_COPY_PASTE,
   CLIPBOARD_TYPE_SELECTION,
-  CLIPBOARD_TYPE_DRAG
+  CLIPBOARD_TYPE_DRAG,
+  CLIPBOARD_TYPE_LAST = CLIPBOARD_TYPE_DRAG
 };
 
 }  // namespace ui