Revert of Don't change layout size due to top control show/hide

third_party/WebKit/Source/core/layout/LayoutView.cpp

Index: third_party/WebKit/Source/core/layout/LayoutView.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutView.cpp b/third_party/WebKit/Source/core/layout/LayoutView.cpp
index 88186a58e368e7f72fe904e233c96f6eefafdf0e..6a96778b49ef000ac9f4c4dfac9e611b9f519cdf 100644
--- a/third_party/WebKit/Source/core/layout/LayoutView.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutView.cpp
@@ -962,9 +962,16 @@
     return m_frameView->hasOpaqueBackground();
 }
 
-FloatSize LayoutView::viewportSizeForViewportUnits() const
-{
-    return frameView() ? frameView()->viewportSizeForViewportUnits() : FloatSize();
+double LayoutView::layoutViewportWidth() const
+{
+    float scale = m_frameView ? m_frameView->frame().pageZoomFactor() : 1;
+    return viewWidth(IncludeScrollbars) / scale;
+}
+
+double LayoutView::layoutViewportHeight() const
+{
+    float scale = m_frameView ? m_frameView->frame().pageZoomFactor() : 1;
+    return viewHeight(IncludeScrollbars) / scale;
 }
 
 void LayoutView::willBeDestroyed()