Refactor UserEventLogging, Add predictedRank, replace Bundle with Proto

b/26494415
- Removed bundle object that became redundant now that we have LauncherEvent proto
- Combined Stats and UserEventLogger as they are effectively doing same thing
- Removed parent field inside Target
- added predictedRank target inside Target

b/27967359
- make com.android.launcher3.action.LAUNCH broadcast explicit
Later CL: finish packageName/intent/componentHash/predictedRank fields

Change-Id: I441fb46c834f73e58a4d2324e8da7971e8713ec8
diff --git a/src/com/android/launcher3/LauncherFiles.java b/src/com/android/launcher3/LauncherFiles.java
index 6ce2293..adb5031 100644
--- a/src/com/android/launcher3/LauncherFiles.java
+++ b/src/com/android/launcher3/LauncherFiles.java
@@ -39,8 +39,8 @@
 
     // TODO: Delete these files on upgrade
     public static final List<String> OBSOLETE_FILES = Collections.unmodifiableList(Arrays.asList(
-            "launches.log",
-            "stats.log",
+            "launches.logTap",
+            "stats.logTap",
             "launcher.preferences",
             "com.android.launcher3.compat.PackageInstallerCompatV16.queue"));
 }