Do 2 GCs on LowMemoryNotification instead of 7.

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 12528)
+++ src/heap.cc	(working copy)
@@ -119,6 +119,7 @@
       debug_utils_(NULL),
 #endif  // DEBUG
       new_space_high_promotion_mode_active_(false),
+      flush_eagerly_(false),
       old_gen_promotion_limit_(kMinimumPromotionLimit),
       old_gen_allocation_limit_(kMinimumAllocationLimit),
       old_gen_limit_factor_(1),
@@ -546,7 +547,8 @@
   mark_compact_collector()->SetFlags(kMakeHeapIterableMask |
                                      kReduceMemoryFootprintMask);
   isolate_->compilation_cache()->Clear();
-  const int kMaxNumberOfAttempts = 7;
+  const int kMaxNumberOfAttempts = 2;
+  FlushEagerly flush_eagerly_scope;
   for (int attempt = 0; attempt < kMaxNumberOfAttempts; attempt++) {
     if (!CollectGarbage(OLD_POINTER_SPACE, MARK_COMPACTOR, gc_reason, NULL)) {
       break;