Kill the real/isolated uid group, not the ApplicationInfo uid

This is a direct reimplementation in L of fixes applied to N in
these two commits:

8dc8d37c1d7d694016f1ec2b3cea5fb723567be8
e8741d23d2dd05c4cb3fed5ee6a4040ee96a60e3

Bug 19285814

Change-Id: I59bcc8f1d41c426e9da635bea9ad1d7c6756d5aa

Merge Conflict resolution to lmp-mr1-release for ag/941553
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 2020bca..b6ec940 100755
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -2479,7 +2479,7 @@
             if (!app.killed) {
                 Slog.wtfStack(TAG, "Removing process that hasn't been killed: " + app);
                 Process.killProcessQuiet(app.pid);
-                Process.killProcessGroup(app.info.uid, app.pid);
+                Process.killProcessGroup(app.uid, app.pid);
             }
             if (lrui <= mLruProcessActivityStart) {
                 mLruProcessActivityStart--;
@@ -2814,7 +2814,7 @@
             // clean it up now.
             if (DEBUG_PROCESSES || DEBUG_CLEANUP) Slog.v(TAG, "App died: " + app);
             checkTime(startTime, "startProcess: bad proc running, killing");
-            Process.killProcessGroup(app.info.uid, app.pid);
+            Process.killProcessGroup(app.uid, app.pid);
             handleAppDiedLocked(app, true, true);
             checkTime(startTime, "startProcess: done killing old proc");
         }
@@ -4696,7 +4696,7 @@
 
         if (!app.killed) {
             Process.killProcessQuiet(pid);
-            Process.killProcessGroup(app.info.uid, pid);
+            Process.killProcessGroup(app.uid, pid);
             app.killed = true;
         }
 
diff --git a/services/core/java/com/android/server/am/ProcessRecord.java b/services/core/java/com/android/server/am/ProcessRecord.java
index a6c616a..d08f12b 100644
--- a/services/core/java/com/android/server/am/ProcessRecord.java
+++ b/services/core/java/com/android/server/am/ProcessRecord.java
@@ -527,7 +527,7 @@
             }
             EventLog.writeEvent(EventLogTags.AM_KILL, userId, pid, processName, setAdj, reason);
             Process.killProcessQuiet(pid);
-            Process.killProcessGroup(info.uid, pid);
+            Process.killProcessGroup(uid, pid);
             if (!persistent) {
                 killed = true;
                 killedByAm = true;