Update some uses of char16 to use the base:: namespace.

ui/base/clipboard/clipboard_win.cc

Index: ui/base/clipboard/clipboard_win.cc
diff --git a/ui/base/clipboard/clipboard_win.cc b/ui/base/clipboard/clipboard_win.cc
index b2f6e0c3565e164f14f96d567cc841d35dd7f94e..f6bd6e8a76c1b84666b60311327f2492340a00c6 100644
--- a/ui/base/clipboard/clipboard_win.cc
+++ b/ui/base/clipboard/clipboard_win.cc
@@ -444,7 +444,7 @@ void Clipboard::ReadText(ClipboardType type, base::string16* result) const {
   if (!data)
     return;
 
-  result->assign(static_cast<const char16*>(::GlobalLock(data)));
+  result->assign(static_cast<const base::char16*>(::GlobalLock(data)));
   ::GlobalUnlock(data);
 }
 
@@ -632,7 +632,7 @@ void Clipboard::ReadBookmark(base::string16* title, std::string* url) const {
   if (!data)
     return;
 
-  base::string16 bookmark(static_cast<const char16*>(::GlobalLock(data)));
+  base::string16 bookmark(static_cast<const base::char16*>(::GlobalLock(data)));
   ::GlobalUnlock(data);
 
   ParseBookmarkClipboardFormat(bookmark, title, url);