ozone: Fix libbase_nacl build after MessagePumpOzone removal

BUG=354062
R=rjkroege@chromium.org, sky@chromium.org
TBR=darin@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/231863010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263057 0039d316-1c4b-4281-b951-d872f2087c98

base/message_loop/message_loop.cc

@@ -680,7 +680,7 @@ void MessageLoopForUI::RemoveObserver(Observer* observer) {
 }
 #endif  //  !defined(OS_MACOSX) && !defined(OS_NACL) && !defined(OS_ANDROID)
 
-#if defined(USE_OZONE)
+#if defined(USE_OZONE) && !defined(OS_NACL)
 bool MessageLoopForUI::WatchFileDescriptor(
     int fd,
     bool persistent,

base/message_loop/message_loop.h

@@ -585,7 +585,7 @@ class BASE_EXPORT MessageLoopForUI : public MessageLoop {
   void RemoveObserver(Observer* observer);
 #endif
 
-#if defined(USE_OZONE)
+#if defined(USE_OZONE) && !defined(OS_NACL)
   // Please see MessagePumpLibevent for definition.
   bool WatchFileDescriptor(
       int fd,