Remove Frame::host() method

third_party/WebKit/Source/core/frame/DOMWindow.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DOMWindow_h
 #define DOMWindow_h
 
 #include "bindings/core/v8/Transferables.h"
 #include "core/CoreExport.h"
 #include "core/events/EventTarget.h"
@@ skipping 18 matching lines @@
 
  public:
   ~DOMWindow() override;
 
   Frame* frame() const {
     // A Frame is typically reused for navigations. If |m_frame| is not null,
     // two conditions must always be true:
     // - |m_frame->domWindow()| must point back to this DOMWindow. If it does
     //   not, it is easy to introduce a bug where script execution uses the
     //   wrong DOMWindow (which may be cross-origin).
-    // - |m_frame| must be attached, i.e. |m_frame->host()| must not be null.
-    //   If |m_frame->host()| is null, this indicates a bug where the frame was
+    // - |m_frame| must be attached, i.e. |m_frame->page()| must not be null.
+    //   If |m_frame->page()| is null, this indicates a bug where the frame was
     //   detached but |m_frame| was not set to null. This bug can lead to
     //   issues where executing script incorrectly schedules work on a detached
     //   frame.
     SECURITY_DCHECK(!m_frame ||
-                    (m_frame->domWindow() == this && m_frame->host()));
+                    (m_frame->domWindow() == this && m_frame->page()));
     return m_frame;
   }
 
   // GarbageCollectedFinalized overrides:
   DECLARE_VIRTUAL_TRACE();
 
   virtual bool isLocalDOMWindow() const = 0;
   virtual bool isRemoteDOMWindow() const = 0;
 
   // ScriptWrappable overrides:
@@ skipping 73 matching lines @@
   // only after the layout widget's deferred window close
   // operation has been performed, exposes (confusing)
   // implementation details to scripts.
   bool m_windowIsClosing;
 
 };
 
 }  // namespace blink
 
 #endif  // DOMWindow_h