Revert "Fix API for C compatibility"

This reverts commit b473061c5a1b6e609188310e8d63f12380b4c74a.

Reason for revert: new API is no longer used

Change-Id: I2c4f9f37736faeb5d0403c2ba531c792d2531505
diff --git a/libutils/Threads.cpp b/libutils/Threads.cpp
index 55eadb0..147db54 100644
--- a/libutils/Threads.cpp
+++ b/libutils/Threads.cpp
@@ -302,8 +302,7 @@
 }
 
 #if defined(__ANDROID__)
-namespace {
-int androidSetThreadPriorityInternal(pid_t tid, int pri, bool change_policy) {
+int androidSetThreadPriority(pid_t tid, int pri, bool change_policy) {
     int rc = 0;
     int lasterr = 0;
     int curr_pri = getpriority(PRIO_PROCESS, tid);
@@ -335,15 +334,6 @@
 
     return rc;
 }
-}  // namespace
-
-int androidSetThreadPriority(pid_t tid, int pri) {
-    return androidSetThreadPriorityInternal(tid, pri, true);
-}
-
-int androidSetThreadPriorityAndPolicy(pid_t tid, int pri, bool change_policy) {
-    return androidSetThreadPriorityInternal(tid, pri, change_policy);
-}
 
 int androidGetThreadPriority(pid_t tid) {
     return getpriority(PRIO_PROCESS, tid);