Oilpan: Remove Heap::s_lastGCWasConservative

Source/platform/heap/Heap.h

Index: Source/platform/heap/Heap.h
diff --git a/Source/platform/heap/Heap.h b/Source/platform/heap/Heap.h
index a3654f54af933d5b94bf37a3483736d0b7b4311e..90dd5a4e893994536f474e636fa7bba980b134af 100644
--- a/Source/platform/heap/Heap.h
+++ b/Source/platform/heap/Heap.h
@@ -1002,10 +1002,6 @@ public:
 
     static void flushHeapDoesNotContainCache();
 
-    // Return true if the last GC found a pointer into a heap page
-    // during conservative scanning.
-    static bool lastGCWasConservative() { return s_lastGCWasConservative; }
-
     static FreePagePool* freePagePool() { return s_freePagePool; }
     static OrphanedPagePool* orphanedPagePool() { return s_orphanedPagePool; }
 
@@ -1073,7 +1069,6 @@ private:
     static CallbackStack* s_ephemeronStack;
     static HeapDoesNotContainCache* s_heapDoesNotContainCache;
     static bool s_shutdownCalled;
-    static bool s_lastGCWasConservative;
     static FreePagePool* s_freePagePool;
     static OrphanedPagePool* s_orphanedPagePool;
     static RegionTree* s_regionTree;