Bug 785960 - "Don't keep activities" developer option gets counted as OOM in telemetry. r=kats

mobile/android/base/GeckoApp.java

@@ -1511,7 +1511,9 @@ abstract public class GeckoApp
                 savedInstanceState.getBoolean(SAVED_STATE_IN_BACKGROUND, false);
             Log.i(LOGTAG, "Was in background: " + wasInBackground);
 
-            if (!wasInBackground) {
+            // Don't log OOM-kills if only one activity was destroyed. (For example
+            // from "Don't keep activities" on ICS)
+            if (!wasInBackground && !mIsRestoringActivity) {
                 Telemetry.HistogramAdd("OUT_OF_MEMORY_KILLED", 1);
             }
         }