Rename platform/Widget to platform/FrameViewBase in core.

third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp

 // Copyright 2015 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.
 
 #include "core/paint/PrePaintTreeWalk.h"
 
 #include "core/dom/DocumentLifecycle.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/layout/LayoutMultiColumnSpannerPlaceholder.h"
@@ skipping 232 matching lines @@
        child = child->nextSibling()) {
     if (child->isLayoutMultiColumnSpannerPlaceholder()) {
       child->getMutableForPainting().clearPaintFlags();
       continue;
     }
     walk(*child, context);
   }
 
   if (object.isLayoutPart()) {
     const LayoutPart& layoutPart = toLayoutPart(object);
-    Widget* widget = layoutPart.widget();
-    if (widget && widget->isFrameView()) {
+    FrameViewBase* frameViewBase = layoutPart.widget();
+    if (frameViewBase && frameViewBase->isFrameView()) {
       context.treeBuilderContext.current.paintOffset +=
           layoutPart.replacedContentRect().location() -
-          widget->frameRect().location();
+          frameViewBase->frameRect().location();
       context.treeBuilderContext.current.paintOffset =
           roundedIntPoint(context.treeBuilderContext.current.paintOffset);
-      walk(*toFrameView(widget), context);
+      walk(*toFrameView(frameViewBase), context);
     }
     // TODO(pdr): Investigate RemoteFrameView (crbug.com/579281).
   }
 
   object.getMutableForPainting().clearPaintFlags();
 }
 
 }  // namespace blink