Remove an obsolete member reference.

Change-Id: I97394489304d86a840b4716b3e5d2f1e26745cfa
diff --git a/vm/alloc/Heap.c b/vm/alloc/Heap.c
index b25e3a4..02eb920 100644
--- a/vm/alloc/Heap.c
+++ b/vm/alloc/Heap.c
@@ -99,10 +99,6 @@
 
 bool dvmHeapStartupAfterZygote(void)
 {
-    /* Update our idea of the last GC start time so that we
-     * don't use the last time that Zygote happened to GC.
-     */
-    gDvm.gcHeap->gcStartTime = dvmGetRelativeTimeUsec();
     return dvmHeapSourceStartupAfterZygote();
 }