Move flash clipboard to the new proxy and add custom format support

content/renderer/renderer_clipboard_client.h

Index: content/renderer/renderer_clipboard_client.h
diff --git a/content/renderer/renderer_clipboard_client.h b/content/renderer/renderer_clipboard_client.h
index 8e7df7840c9b20993ed0041a3e1c4f5a92086dae..58dd8a55f166a448f3277274d0ec5faa43d25acb 100644
--- a/content/renderer/renderer_clipboard_client.h
+++ b/content/renderer/renderer_clipboard_client.h
@@ -5,6 +5,8 @@
 #ifndef CONTENT_RENDERER_RENDERER_CLIPBOARD_CLIENT_H_
 #define CONTENT_RENDERER_RENDERER_CLIPBOARD_CLIENT_H_
 
+#include <string>
+
 #include "base/compiler_specific.h"
 #include "webkit/glue/clipboard_client.h"
 
@@ -38,6 +40,8 @@ class RendererClipboardClient : public webkit_glue::ClipboardClient {
   virtual void ReadCustomData(ui::Clipboard::Buffer buffer,
                               const string16& type,
                               string16* data) OVERRIDE;
+  virtual void ReadData(const ui::Clipboard::FormatType& format,
+                        std::string* data) OVERRIDE;
   virtual WriteContext* CreateWriteContext() OVERRIDE;
 };