Hook up large heap API.

Change-Id: I215644f8de326fe3d4fa582447885b0aa01f72d3
diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index db046ef..7cf60f9 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -3463,7 +3463,7 @@
         }
 
         if ((data.appInfo.flags&ApplicationInfo.FLAG_LARGE_HEAP) != 0) {
-            // XXX bump up Dalvik's heap.
+            dalvik.system.VMRuntime.getRuntime().clearGrowthLimit();
         }
 
         // If the app is being launched for full backup or restore, bring it up in