Rename WorkSource methods on Binder and IPCThreadState.

This change only renames methods, there is no behavior changes except
using the new restore methods instead of clear.

Test: unit tests
Change-Id: I35ae966461657e2e2a67e916d752b9ee53381c83
diff --git a/core/java/android/os/Handler.java b/core/java/android/os/Handler.java
index f3a9a50..e8704af 100644
--- a/core/java/android/os/Handler.java
+++ b/core/java/android/os/Handler.java
@@ -739,7 +739,7 @@
 
     private boolean enqueueMessage(MessageQueue queue, Message msg, long uptimeMillis) {
         msg.target = this;
-        msg.workSourceUid = ThreadLocalWorkSourceUid.get();
+        msg.workSourceUid = ThreadLocalWorkSource.getUid();
 
         if (mAsynchronous) {
             msg.setAsynchronous(true);