Bug 1162673 - Part 1: Remove instances of #ifdef PR_LOGGING in layout. r=froydnj

PR_LOGGING is now always defined, we can remove #ifdefs checking for it.

layout/generic/nsPluginFrame.cpp

@@ -93,7 +93,6 @@ using mozilla::DefaultXDisplay;
 #undef CreateEvent
 #endif
 
-#ifdef PR_LOGGING 
 static PRLogModuleInfo *
 GetObjectFrameLog()
 {
@@ -102,7 +101,6 @@ GetObjectFrameLog()
     sLog = PR_NewLogModule("nsPluginFrame");
   return sLog;
 }
-#endif /* PR_LOGGING */
 
 using namespace mozilla;
 using namespace mozilla::gfx;