Revert of Oilpan: Rename heap classes

Source/platform/heap/Visitor.cpp

Index: Source/platform/heap/Visitor.cpp
diff --git a/Source/platform/heap/Visitor.cpp b/Source/platform/heap/Visitor.cpp
index 2bf1ea1bda32405f3ce9ccbd22bfdbb3729e3284..d5bc469abf586172842bb25d4df8397856021689 100644
--- a/Source/platform/heap/Visitor.cpp
+++ b/Source/platform/heap/Visitor.cpp
@@ -102,7 +102,7 @@
 #if !defined(COMPONENT_BUILD)
     // On component builds we cannot compare the gcInfos as they are statically
     // defined in each of the components and hence will not match.
-    BasePage* page = pageFromObject(payload);
+    BaseHeapPage* page = pageFromObject(payload);
     ASSERT(page->orphaned() || HeapObjectHeader::fromPayload(payload)->gcInfoIndex() == gcInfoIndex);
 #endif
 }