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

third_party/WebKit/Source/core/css/resolver/ViewportStyleResolver.cpp

Index: third_party/WebKit/Source/core/css/resolver/ViewportStyleResolver.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/ViewportStyleResolver.cpp b/third_party/WebKit/Source/core/css/resolver/ViewportStyleResolver.cpp
index 9688ef22bf5ea4a1092243d156636be996f5a5aa..642508cb14e55c9ad3c6b410b8ff7fba5d0cbe8b 100644
--- a/third_party/WebKit/Source/core/css/resolver/ViewportStyleResolver.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/ViewportStyleResolver.cpp
@@ -39,6 +39,7 @@
 #include "core/dom/Document.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/ViewportDescription.h"
+#include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 
 namespace blink {
@@ -200,8 +201,12 @@
     bool documentStyleHasViewportUnits = documentStyle->hasViewportUnits();
     documentStyle->setHasViewportUnits(false);
 
+    FrameView* view = m_document->view();
+    float width = view ? view->width() : 0;
+    float height = view ? view->height() : 0;
+
     CSSToLengthConversionData::FontSizes fontSizes(documentStyle, documentStyle);
-    CSSToLengthConversionData::ViewportSize viewportSize(m_document->layoutView());
+    CSSToLengthConversionData::ViewportSize viewportSize(width, height);
 
     if (primitiveValue->getValueID() == CSSValueAuto)
         return Length(Auto);