Made Frame constructors (and subclasses) take Page& instead of Page*

third_party/WebKit/Source/core/frame/Frame.cpp

Index: third_party/WebKit/Source/core/frame/Frame.cpp
diff --git a/third_party/WebKit/Source/core/frame/Frame.cpp b/third_party/WebKit/Source/core/frame/Frame.cpp
index a3d935d830d1188a95059f777c4b59cf84ad33d0..e9ea714dc6d75ae8a21f7bbf99f35254ec206376 100644
--- a/third_party/WebKit/Source/core/frame/Frame.cpp
+++ b/third_party/WebKit/Source/core/frame/Frame.cpp
@@ -419,19 +419,17 @@ bool Frame::isFeatureEnabled(WebFeaturePolicyFeature feature) const {
 }
 
 Frame::Frame(FrameClient* client,
-             Page* page,
+             Page& page,
              FrameOwner* owner,
              WindowProxyManager* windowProxyManager)
     : m_treeNode(this),
-      m_page(page),
+      m_page(&page),
       m_owner(owner),
       m_client(client),
       m_windowProxyManager(windowProxyManager),
       m_isLoading(false) {
   InstanceCounters::incrementCounter(InstanceCounters::FrameCounter);
 
-  DCHECK(m_page);
-
   if (m_owner)
     m_owner->setContentFrame(*this);
   else