Remove GetP2PSocketDispatcher from PepperPluginDelegate interface.

webkit/plugins/ppapi/mock_plugin_delegate.cc

Index: webkit/plugins/ppapi/mock_plugin_delegate.cc
diff --git a/webkit/plugins/ppapi/mock_plugin_delegate.cc b/webkit/plugins/ppapi/mock_plugin_delegate.cc
index c34643aa19e3f90325d9d2468de05cb3fef78535..211979b6af58d60c38065b49b0ab4bfee6e51b7e 100644
--- a/webkit/plugins/ppapi/mock_plugin_delegate.cc
+++ b/webkit/plugins/ppapi/mock_plugin_delegate.cc
@@ -259,10 +259,6 @@ void MockPluginDelegate::SetContentRestriction(int restrictions) {
 void MockPluginDelegate::SaveURLAs(const GURL& url) {
 }
 
-content::P2PSocketDispatcher* MockPluginDelegate::GetP2PSocketDispatcher() {
-  return NULL;
-}
-
 webkit_glue::P2PTransport* MockPluginDelegate::CreateP2PTransport() {
   return NULL;
 }