Revert "Add choice for changing sched policy when setting thread priority"

This reverts commit 57affbf91d016eda1395106c4d5f0350471dca85.

Reason for revert: new API is no longer used

Change-Id: I97128c1d367e161aa50deaefa8b73a0f25e29af4
diff --git a/libutils/include/utils/AndroidThreads.h b/libutils/include/utils/AndroidThreads.h
index 3c30a2a..a8d7851 100644
--- a/libutils/include/utils/AndroidThreads.h
+++ b/libutils/include/utils/AndroidThreads.h
@@ -78,9 +78,7 @@
 // should be one of the ANDROID_PRIORITY constants.  Returns INVALID_OPERATION
 // if the priority set failed, else another value if just the group set failed;
 // in either case errno is set.  Thread ID zero means current thread.
-// Parameter "change_policy" indicates if sched policy should be changed. It needs
-// not be checked again if the change is done elsewhere like activity manager.
-extern int androidSetThreadPriority(pid_t tid, int prio, bool change_policy = true);
+extern int androidSetThreadPriority(pid_t tid, int prio);
 
 // Get the current priority of a particular thread. Returns one of the
 // ANDROID_PRIORITY constants or a negative result in case of error.