Move thread_ conditional back under defines.

webrtc/base/platform_thread.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 184 matching lines @@
     // Alertable sleep to permit RaiseFlag to run and update |stop_|.
     SleepEx(0, true);
   } while (!stop_);
 #else
   } while (!stop_event_.Wait(0));
 #endif  // defined(WEBRTC_WIN)
 }
 
 bool PlatformThread::SetPriority(ThreadPriority priority) {
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
-  if (!thread_)
-    return false;
 #if defined(WEBRTC_WIN)
-  return SetThreadPriority(thread_, priority);
+  return thread_ && SetThreadPriority(thread_, priority);
 #elif defined(__native_client__)
   // Setting thread priorities is not supported in NaCl.
   return true;
 #elif defined(WEBRTC_CHROMIUM_BUILD) && defined(WEBRTC_LINUX)
   // TODO(tommi): Switch to the same mechanism as Chromium uses for changing
   // thread priorities.
   return true;
 #else
+  if (!thread_)
+    return false;
 #ifdef WEBRTC_THREAD_RR
   const int policy = SCHED_RR;
 #else
   const int policy = SCHED_FIFO;
 #endif
   const int min_prio = sched_get_priority_min(policy);
   const int max_prio = sched_get_priority_max(policy);
   if (min_prio == -1 || max_prio == -1) {
     return false;
   }
@@ skipping 22 matching lines @@
       break;
     case kRealtimePriority:
       param.sched_priority = top_prio;
       break;
   }
   return pthread_setschedparam(thread_, policy, &param) == 0;
 #endif  // defined(WEBRTC_WIN)
 }
 
 }  // namespace webrtc