Revert "Fix heap trimmer daemon sleeping."

This reverts commit 698b44634396e8111e96e1116586fde89a838347.

(cherry picked from commit 4d3981c72a546b87c8f5d391ff8b5135b8ca99a7)

Change-Id: I7245bc08ebb95c12e7cc71b97edf9ca11ffbdf61
diff --git a/runtime/gc/heap.h b/runtime/gc/heap.h
index 3bfa748..9742277 100644
--- a/runtime/gc/heap.h
+++ b/runtime/gc/heap.h
@@ -830,8 +830,8 @@
   Mutex* heap_trim_request_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
   // When we want to perform the next heap trim (nano seconds).
   uint64_t last_trim_time_ GUARDED_BY(heap_trim_request_lock_);
-  // When we last performed a heap transition or hspace compact.
-  uint64_t last_heap_transition_time_;
+  // When we want to perform the next heap transition (nano seconds) or heap trim.
+  uint64_t heap_transition_or_trim_target_time_ GUARDED_BY(heap_trim_request_lock_);
   // If we have a heap trim request pending.
   bool heap_trim_request_pending_ GUARDED_BY(heap_trim_request_lock_);