Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/web/tests/WebViewTest.cpp

Index: third_party/WebKit/Source/web/tests/WebViewTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/WebViewTest.cpp b/third_party/WebKit/Source/web/tests/WebViewTest.cpp
index df46990a39ed03fd49bd3f684c52f7646d77f078..e565ec3ccdfcf28163cc3f8ee5d2d89ce1dc8100 100644
--- a/third_party/WebKit/Source/web/tests/WebViewTest.cpp
+++ b/third_party/WebKit/Source/web/tests/WebViewTest.cpp
@@ -2449,7 +2449,7 @@ TEST_F(WebViewTest, DeleteElementWithRegisteredHandler)
     // checking below. We do a precise GC (collectAllGarbage does not scan the stack)
     // to ensure the div element dies. This is also why the Document is in a Persistent
     // since we want that to stay around.
-    Heap::collectAllGarbage();
+    ThreadHeap::collectAllGarbage();
 #endif
     EXPECT_FALSE(registry.hasEventHandlers(EventHandlerRegistry::ScrollEvent));
 }