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

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

Index: third_party/WebKit/Source/core/frame/PageScaleConstraintsSet.h
diff --git a/third_party/WebKit/Source/core/frame/PageScaleConstraintsSet.h b/third_party/WebKit/Source/core/frame/PageScaleConstraintsSet.h
index 0dabd0f8a07769d640c6fc3715f070c0f1048347..7104d6daa23c45c9125d662b71d2cba831619383 100644
--- a/third_party/WebKit/Source/core/frame/PageScaleConstraintsSet.h
+++ b/third_party/WebKit/Source/core/frame/PageScaleConstraintsSet.h
@@ -85,9 +85,7 @@ public:
     // This is set when one of the inputs to finalConstraints changes.
     bool constraintsDirty() const { return m_constraintsDirty; }
 
-    void didChangeViewSize(const IntSize&);
-
-    IntSize mainFrameSize() const;
+    void didChangeInitialContainingBlockSize(const IntSize&);
 
     IntSize layoutSize() const;
 
@@ -103,7 +101,7 @@ private:
     PageScaleConstraints m_finalConstraints;
 
     int m_lastContentsWidth;
-    IntSize m_viewSize;
+    IntSize m_icbSize;
 
     bool m_needsReset;
     bool m_constraintsDirty;