Need to clear viewport dependent units switching print mode.

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

Index: third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp b/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
index 24e802cedab22282b5d74a959857aa211d25e353..282ac47b0d4fd8f5adeb385cc0c90d5ad422c2ab 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp
@@ -1917,8 +1917,11 @@ void StyleResolver::computeFont(ComputedStyle* style,
 
 void StyleResolver::updateMediaType() {
   if (FrameView* view = document().view()) {
+    bool wasPrint = m_printMediaType;
     m_printMediaType =
         equalIgnoringCase(view->mediaType(), MediaTypeNames::print);
+    if (wasPrint != m_printMediaType)
+      m_matchedPropertiesCache.clearViewportDependent();
   }
 }