[heap] Remove --experimental_new_space_growth_heuristic

The flag is old and is disabled by default.

Change-Id: Ica1e4f3d7a9ec0e1130a8b097848251f9dc74ce0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2108727Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66777}

src/flags/flag-definitions.h

@@ -818,9 +818,6 @@ DEFINE_SIZE_T(max_semi_space_size, 0,
               "max size of a semi-space (in MBytes), the new space consists of "
               "two semi-spaces")
 DEFINE_INT(semi_space_growth_factor, 2, "factor by which to grow the new space")
-DEFINE_BOOL(experimental_new_space_growth_heuristic, false,
-            "Grow the new space based on the percentage of survivors instead "
-            "of their absolute value.")
 DEFINE_SIZE_T(max_old_space_size, 0, "max size of the old space (in Mbytes)")
 DEFINE_SIZE_T(
     max_heap_size, 0,

src/heap/heap.cc

@@ -2314,16 +2314,8 @@ void Heap::MarkCompactPrologue() {
 
 
 void Heap::CheckNewSpaceExpansionCriteria() {
-  if (FLAG_experimental_new_space_growth_heuristic) {
-    if (new_space_->TotalCapacity() < new_space_->MaximumCapacity() &&
-        survived_last_scavenge_ * 100 / new_space_->TotalCapacity() >= 10) {
-      // Grow the size of new space if there is room to grow, and more than 10%
-      // have survived the last scavenge.
-      new_space_->Grow();
-      survived_since_last_expansion_ = 0;
-    }
-  } else if (new_space_->TotalCapacity() < new_space_->MaximumCapacity() &&
-             survived_since_last_expansion_ > new_space_->TotalCapacity()) {
+  if (new_space_->TotalCapacity() < new_space_->MaximumCapacity() &&
+      survived_since_last_expansion_ > new_space_->TotalCapacity()) {
     // Grow the size of new space if there is room to grow, and enough data
     // has survived scavenge since the last expansion.
     new_space_->Grow();