Temporarily disable SetPriority when building with Chromium.
This is due to errors we were hitting with Chromium's sandbox policy for pthread_setschedparam.

R=magjed@webrtc.org, pbos@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/45839004

Cr-Commit-Position: refs/heads/master@{#8829}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8829 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/system_wrappers/source/thread_posix.cc b/webrtc/system_wrappers/source/thread_posix.cc
index dc95cbc..e110af5 100644
--- a/webrtc/system_wrappers/source/thread_posix.cc
+++ b/webrtc/system_wrappers/source/thread_posix.cc
@@ -115,7 +115,11 @@
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!thread_)
     return false;
-
+#if defined(WEBRTC_CHROMIUM_BUILD)
+  // TODO(tommi): Switch to the same mechanism as Chromium uses for
+  // changing thread priorities.
+  return true;
+#else
 #ifdef WEBRTC_THREAD_RR
   const int policy = SCHED_RR;
 #else
@@ -141,6 +145,7 @@
   }
 
   return true;
+#endif  // defined(WEBRTC_CHROMIUM_BUILD)
 }
 
 void ThreadPosix::Run() {