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 207755dce28e93aa76270b9229c1bdc8d45bc2b2..e4ae6a69b593d87ee8037bcdfc7122b08e4bc6ed 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.