Update ActivityManager.opeContentUri transaction id.

Bug: 30977067
Test: Verified that transaction can be made from native code
      to ActivityManagerService.
Change-Id: Icb56b6be2e7a10d1883bfcdd94808d225df4a9d8
diff --git a/media/libmediaplayerservice/ActivityManager.cpp b/media/libmediaplayerservice/ActivityManager.cpp
index 60a209f..0e6cf7b 100644
--- a/media/libmediaplayerservice/ActivityManager.cpp
+++ b/media/libmediaplayerservice/ActivityManager.cpp
@@ -24,7 +24,7 @@
 
 namespace android {
 
-const uint32_t OPEN_CONTENT_URI_TRANSACTION = IBinder::FIRST_CALL_TRANSACTION + 4;
+const uint32_t OPEN_CONTENT_URI_TRANSACTION = IBinder::FIRST_CALL_TRANSACTION;
 
 // Perform ContentProvider.openFile() on the given URI, returning
 // the resulting native file descriptor.  Returns < 0 on error.