Non-SFI mode: Clean up macros of base/ and ipc/ libraries for nacl_helper_nonsfi.

Now, OS_NACL_SFI and OS_NACL_NONSFI are introduced to build/build_config.h, and these are preferred to __native_client_nonsfi__ and OS_NACL combination.

BUG=358465
TEST=Ran trybots.

Review URL: https://codereview.chromium.org/704513003

Cr-Commit-Position: refs/heads/master@{#302907}


CrOS-Libchrome-Original-Commit: 853d6084e2f55a046ca7e3cc0ec427a26587f938
diff --git a/base/message_loop/message_loop.cc b/base/message_loop/message_loop.cc
index f1d0d3b..01402d0 100644
--- a/base/message_loop/message_loop.cc
+++ b/base/message_loop/message_loop.cc
@@ -100,7 +100,7 @@
 
 #if defined(OS_IOS)
 typedef MessagePumpIOSForIO MessagePumpForIO;
-#elif defined(OS_NACL) && !defined(__native_client_nonsfi__)
+#elif defined(OS_NACL_SFI)
 typedef MessagePumpDefault MessagePumpForIO;
 #elif defined(OS_POSIX)
 typedef MessagePumpLibevent MessagePumpForIO;
@@ -676,7 +676,7 @@
 //------------------------------------------------------------------------------
 // MessageLoopForIO
 
-#if !defined(OS_NACL) || defined(__native_client_nonsfi__)
+#if !defined(OS_NACL_SFI)
 void MessageLoopForIO::AddIOObserver(
     MessageLoopForIO::IOObserver* io_observer) {
   ToPumpIO(pump_.get())->AddIOObserver(io_observer);
@@ -714,6 +714,6 @@
 }
 #endif
 
-#endif  // !defined(OS_NACL) || defined(__native_client_nonsfi__)
+#endif  // !defined(OS_NACL_SFI)
 
 }  // namespace base