Modified the flash cipboard interface to add html clipboard support.

ui/base/clipboard/scoped_clipboard_writer.h

Index: ui/base/clipboard/scoped_clipboard_writer.h
diff --git a/ui/base/clipboard/scoped_clipboard_writer.h b/ui/base/clipboard/scoped_clipboard_writer.h
index 08aaa3a21b9625fabeb5d4b2b24d71e31bbab200..7be77401cde71404c6be20b169c16d9cf34ae433 100644
--- a/ui/base/clipboard/scoped_clipboard_writer.h
+++ b/ui/base/clipboard/scoped_clipboard_writer.h
@@ -63,6 +63,9 @@ class UI_EXPORT ScopedClipboardWriter {
   void WritePickledData(const Pickle& pickle,
                         const Clipboard::FormatType& format);
 
+  // Removes all objects that would be written to the clipboard.
+  void Reset();
+
  protected:
   // Converts |text| to UTF-8 and adds it to the clipboard.  If it's a URL, we
   // also notify the clipboard of that fact.