Reset viewport to implicit when @viewport is removed.

Source/core/css/resolver/ViewportStyleResolver.cpp

Index: Source/core/css/resolver/ViewportStyleResolver.cpp
diff --git a/Source/core/css/resolver/ViewportStyleResolver.cpp b/Source/core/css/resolver/ViewportStyleResolver.cpp
index 4480d7f47ed72473c1df70a02e517c538613d8a5..34239374452d71ee590cdda4ac0ae685e9848c03 100644
--- a/Source/core/css/resolver/ViewportStyleResolver.cpp
+++ b/Source/core/css/resolver/ViewportStyleResolver.cpp
@@ -75,9 +75,21 @@ void ViewportStyleResolver::clearDocument()
 
 void ViewportStyleResolver::resolve()
 {
-    if (!m_document || !m_propertySet)
+    if (!m_document)
         return;
 
+    if (!m_propertySet) {
+        // FIXME: This is not entirely correct. If the doctype is XHTML MP, or there is a Meta
+        // element for setting the viewport, the viewport arguments should fall back to those
+        // settings when the @viewport rules are all removed. For now, reset to implicit when
+        // there was an @viewport rule which has now been removed.
+        if (m_document->viewportArguments().type == ViewportArguments::CSSDeviceAdaptation) {

[kenneth.r.christiansen, 2013/08/21 08:28:35]

Did you test if this is also an issue after my ->@viewport translation patch?

+            m_document->setViewportArguments(ViewportArguments());
+            m_document->updateViewportArguments();
+        }
+        return;
+    }
+
     ViewportArguments arguments(ViewportArguments::CSSDeviceAdaptation);
 
     arguments.userZoom = getViewportArgumentValue(CSSPropertyUserZoom);