Remove the old PPB_Flash proxy.

ppapi/proxy/ppb_instance_proxy.cc

Index: ppapi/proxy/ppb_instance_proxy.cc
diff --git a/ppapi/proxy/ppb_instance_proxy.cc b/ppapi/proxy/ppb_instance_proxy.cc
index 61ddab445dfaa2883f4e4dd5dfb00152d2090bac..abe316827e0c5b081f00367dcd586e7479680f99 100644
--- a/ppapi/proxy/ppb_instance_proxy.cc
+++ b/ppapi/proxy/ppb_instance_proxy.cc
@@ -26,7 +26,6 @@
 #include "ppapi/proxy/host_dispatcher.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/ppapi_messages.h"
-#include "ppapi/proxy/ppb_flash_proxy.h"
 #include "ppapi/proxy/serialized_var.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/ppb_url_util_shared.h"
@@ -340,11 +339,6 @@ PP_Bool PPB_Instance_Proxy::GetScreenSize(PP_Instance instance,
   return result;
 }
 
-thunk::PPB_Flash_API* PPB_Instance_Proxy::GetFlashAPI() {
-  InterfaceProxy* ip = dispatcher()->GetInterfaceProxy(API_ID_PPB_FLASH);
-  return static_cast<PPB_Flash_Proxy*>(ip);
-}
-
 Resource* PPB_Instance_Proxy::GetSingletonResource(PP_Instance instance,
                                                    SingletonResourceID id) {
   InstanceData* data = static_cast<PluginDispatcher*>(dispatcher())->