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

ppapi/thunk/ppb_flash_api.h

Index: ppapi/thunk/ppb_flash_api.h
diff --git a/ppapi/thunk/ppb_flash_api.h b/ppapi/thunk/ppb_flash_api.h
index 7a1a641513b0b8e5010b950eac613c976a41f2c4..1a7ed5be5827247d354cf7c5c1157b3080bfcc2e 100644
--- a/ppapi/thunk/ppb_flash_api.h
+++ b/ppapi/thunk/ppb_flash_api.h
@@ -6,7 +6,6 @@
 #define PPAPI_THUNK_PPB_FLASH_API_H_
 
 #include "ppapi/c/private/ppb_flash.h"
-#include "ppapi/c/private/ppb_flash_clipboard.h"
 #include "ppapi/c/private/ppb_flash_file.h"
 #include "ppapi/thunk/ppapi_thunk_export.h"
 
@@ -68,20 +67,6 @@ class PPAPI_THUNK_EXPORT PPB_Flash_API {
                                PP_FlashCrashKey key,
                                PP_Var value) = 0;
 
-  // FlashClipboard.
-  virtual PP_Bool IsClipboardFormatAvailable(
-      PP_Instance instance,
-      PP_Flash_Clipboard_Type clipboard_type,
-      PP_Flash_Clipboard_Format format) = 0;
-  virtual PP_Var ReadClipboardData(PP_Instance instance,
-                                   PP_Flash_Clipboard_Type clipboard_type,
-                                   PP_Flash_Clipboard_Format format) = 0;
-  virtual int32_t WriteClipboardData(PP_Instance instance,
-                                     PP_Flash_Clipboard_Type clipboard_type,
-                                     uint32_t data_item_count,
-                                     const PP_Flash_Clipboard_Format formats[],
-                                     const PP_Var data_items[]) = 0;
-
   // FlashFile_ModuleLocal.
   virtual bool CreateThreadAdapterForInstance(PP_Instance instance) = 0;
   virtual void ClearThreadAdapterForInstance(PP_Instance instance) = 0;