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 fdf24de7de2a5a962ffc337dedc6b423320e5e84..a39bc776c1141504730417d76cc764391de519ee 100644
--- a/Source/platform/heap/Heap.h
+++ b/Source/platform/heap/Heap.h
@@ -918,6 +918,7 @@ public:
     static void collectAllGarbage();
 
     static void processMarkingStack(Visitor*);
+    static void processEphemerons(Visitor*);
     static void postMarkingProcessing(Visitor*);
     static void globalWeakProcessing(Visitor*);
     static void setForcePreciseGCForTesting();
@@ -946,10 +947,6 @@ 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; }
 
@@ -1015,7 +1012,6 @@ 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;