Copy StyleVisualData::m_zoom in copy constructor.

third_party/WebKit/Source/core/style/StyleVisualData.cpp

Index: third_party/WebKit/Source/core/style/StyleVisualData.cpp
diff --git a/third_party/WebKit/Source/core/style/StyleVisualData.cpp b/third_party/WebKit/Source/core/style/StyleVisualData.cpp
index 55a9a72afeab31347b540c1f6fd396bfc366d1b1..7e29491c12902cbd9997d57a442dffbc5bf3c911 100644
--- a/third_party/WebKit/Source/core/style/StyleVisualData.cpp
+++ b/third_party/WebKit/Source/core/style/StyleVisualData.cpp
@@ -37,8 +37,6 @@ StyleVisualData::StyleVisualData(const StyleVisualData& o)
       clip(o.clip),
       hasAutoClip(o.hasAutoClip),
       textDecoration(o.textDecoration),
-      m_zoom(ComputedStyle::initialZoom()) {
-  DCHECK(m_zoom == o.m_zoom);  // crbug.com/689330
-}
+      m_zoom(o.m_zoom) {}
 
 }  // namespace blink