Log "schlepping drawable" messages as PLUGIN_LOG_DEBUG. no r=, trivial

--HG--
extra : transplant_source : %10%9E-%8B%09%5D2%F6%97%C0k%0E%08%20%A1%1C%1B%B1%23z

dom/plugins/PluginInstanceChild.cpp

@@ -401,8 +401,8 @@ PluginInstanceChild::AnswerNPP_HandleEvent(const NPRemoteEvent& event,
 
 #if defined(OS_LINUX) && defined(DEBUG)
     if (GraphicsExpose == event.event.type)
-        printf("  received drawable 0x%lx\n",
-               event.event.xgraphicsexpose.drawable);
+        PLUGIN_LOG_DEBUG(("  received drawable 0x%lx\n",
+                          event.event.xgraphicsexpose.drawable));
 #endif
 
     // Make a copy since we may modify values.

dom/plugins/PluginInstanceParent.cpp

@@ -588,8 +588,8 @@ PluginInstanceParent::NPP_HandleEvent(void* event)
 
 #if defined(MOZ_X11)
     if (GraphicsExpose == npevent->type) {
-        printf("  schlepping drawable 0x%lx across the pipe\n",
-               npevent->xgraphicsexpose.drawable);
+        PLUGIN_LOG_DEBUG(("  schlepping drawable 0x%lx across the pipe\n",
+                          npevent->xgraphicsexpose.drawable));
         // Make sure the X server has created the Drawable and completes any
         // drawing before the plugin draws on top.
         //