Reimplement the Pepper fullscreen API to use webkitRequestFullScreen and friends.

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..b42dbf1a3a2bd83f549d94e96581d93ff283fa90 100644
--- a/webkit/plugins/ppapi/mock_plugin_delegate.cc
+++ b/webkit/plugins/ppapi/mock_plugin_delegate.cc
@@ -223,11 +223,6 @@ int32_t MockPluginDelegate::ShowContextMenu(
   return PP_ERROR_FAILED;
 }
 
-FullscreenContainer* MockPluginDelegate::CreateFullscreenContainer(
-    PluginInstance* instance) {
-  return NULL;
-}
-
 gfx::Size MockPluginDelegate::GetScreenSize() {
   return gfx::Size(1024, 768);
 }