[heap] remove unneeded call to LowerInlineAllocationLimit

Calling LowerInlineAllocationLimit from the bottom of Heap::Scavenge seems to be
a no-op.

  new_space_.LowerInlineAllocationLimit(
      new_space_.inline_allocation_limit_step());

LowerInlineAllocatoinLimit does the following things:

1. Set the inline_allocation_limit_step_ to the passed in value. No-op.
2. Calls UpdateInlineAllocationLimit(0). This is unnecessary here as it has
   already been called when new_space_.ResetAllocationInfo was called above.
3. Sets top_on_previous_step_. This again is unnecessary as it gets reached by
   ResetAllocationInfo as well.

BUG=
R=hpayer@chromium.org,ulan@chromium.org

Review URL: https://codereview.chromium.org/1390013002

Cr-Commit-Position: refs/heads/master@{#31156}

src/heap/heap.cc

@@ -1689,9 +1689,6 @@ void Heap::Scavenge() {
   // Set age mark.
   new_space_.set_age_mark(new_space_.top());
 
-  new_space_.LowerInlineAllocationLimit(
-      new_space_.inline_allocation_limit_step());
-
   array_buffer_tracker()->FreeDead(true);
 
   // Update how much has survived scavenge.

src/heap/spaces.h

@@ -2702,10 +2702,6 @@ class NewSpace : public Space {
 
   bool IsFromSpaceCommitted() { return from_space_.is_committed(); }
 
-  inline intptr_t inline_allocation_limit_step() {
-    return inline_allocation_limit_step_;
-  }
-
   SemiSpace* active_space() { return &to_space_; }
 
  private: