Pass implementation object to supplemental classes by reference

Source/core/html/HTMLImportsController.cpp

Index: Source/core/html/HTMLImportsController.cpp
diff --git a/Source/core/html/HTMLImportsController.cpp b/Source/core/html/HTMLImportsController.cpp
index 7baf599522817cc645c893d627d627555d868cb3..2365627450c5a9b27a84c6e9c4eaa5f4f034a770 100644
--- a/Source/core/html/HTMLImportsController.cpp
+++ b/Source/core/html/HTMLImportsController.cpp
@@ -38,16 +38,16 @@
 
 namespace WebCore {
 
-void HTMLImportsController::provideTo(Document* master)
+void HTMLImportsController::provideTo(Document& master)
 {
     DEFINE_STATIC_LOCAL(const char*, name, ("HTMLImportsController"));
     OwnPtr<HTMLImportsController> controller = adoptPtr(new HTMLImportsController(master));
-    master->setImport(controller.get());
+    master.setImport(controller.get());
     DocumentSupplement::provideTo(master, name, controller.release());
 }
 
-HTMLImportsController::HTMLImportsController(Document* master)
-    : m_master(master)
+HTMLImportsController::HTMLImportsController(Document& master)
+    : m_master(&master)
     , m_recalcTimer(this, &HTMLImportsController::recalcTimerFired)
 {
     recalcTreeState(this); // This recomputes initial state.