heap: Remove unused methods from Allocator abstraction

Bug: chromium:1056170
Change-Id: Ib7b522020be7c198e405c9561376faa898e6a493
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532579
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826555}

third_party/blink/renderer/platform/heap/impl/heap_allocator.h

@@ -130,10 +130,6 @@ class PLATFORM_EXPORT HeapAllocator {
     return ThreadState::Current()->IsAllocationAllowed();
   }
 
-  static bool IsSweepForbidden() {
-    return ThreadState::Current()->SweepForbidden();
-  }
-
   static bool IsIncrementalMarking() {
     return ThreadState::IsAnyIncrementalMarking() &&
            ThreadState::Current()->IsIncrementalMarking();

third_party/blink/renderer/platform/wtf/allocator/partition_allocator.h

@@ -79,12 +79,8 @@ class WTF_EXPORT PartitionAllocator {
   static void TraceBackingStoreIfMarked(const void*) {}
   template <typename T>
   static void BackingWriteBarrier(T**) {}
-  template <typename, typename T>
-  static void BackingWriteBarrierForHashTable(T**) {}
 
   static bool IsAllocationAllowed() { return true; }
-  static bool IsObjectResurrectionForbidden() { return false; }
-  static bool IsSweepForbidden() { return false; }
   static bool IsIncrementalMarking() { return false; }
 
   static void EnterGCForbiddenScope() {}