Remove NOTIMPLEMENTED() from PlatformThread::SetThreadPriority() for posix.

base/threading/platform_thread_posix.cc

Index: base/threading/platform_thread_posix.cc
diff --git a/base/threading/platform_thread_posix.cc b/base/threading/platform_thread_posix.cc
index cfcabe583a9c2b38247da102e574bcd2841306eb..24bf3d2b8a565e86538d2f06b96c0b40df2f125a 100644
--- a/base/threading/platform_thread_posix.cc
+++ b/base/threading/platform_thread_posix.cc
@@ -248,12 +248,11 @@ void PlatformThread::Join(PlatformThreadHandle thread_handle) {
 }
 
 #if !defined(OS_MACOSX)
-// Mac OS X uses lower-level mach APIs
+// Mac OS X uses lower-level mach APIs.
 
 // static
 void PlatformThread::SetThreadPriority(PlatformThreadHandle, ThreadPriority) {
-  // TODO(crogers): implement
-  NOTIMPLEMENTED();
+  // TODO(crogers): Implement, see http://crbug.com/116172
 }
 #endif