Use StringPiece for UTF string conversions.

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 92632c74a965bc59388b3bab595fa13a358a6883..05cdee9c2e6632316ca48c2814b2b26870579d8e 100644
--- a/ui/base/clipboard/clipboard_win.cc
+++ b/ui/base/clipboard/clipboard_win.cc
@@ -227,8 +227,8 @@ void Clipboard::WriteObjects(ClipboardType type, const ObjectMap& objects) {
 }
 
 void Clipboard::WriteText(const char* text_data, size_t text_len) {
-  string16 text;
-  UTF8ToUTF16(text_data, text_len, &text);
+  base::string16 text =
+      base::UTF8ToUTF16(base::StringPiece(text_data, text_len));
   HGLOBAL glob = CreateGlobalData(text);
 
   WriteToClipboard(CF_UNICODETEXT, glob);