Unprefix the @viewport rule of CSS Device Adaptation spec

Source/core/css/CSSParser.cpp

Index: Source/core/css/CSSParser.cpp
diff --git a/Source/core/css/CSSParser.cpp b/Source/core/css/CSSParser.cpp
index 76af9509a320d75c4da04c84c0f035d5b46df6a9..33efaeb4dbf4c110aae966606553df5d7a686fab 100644
--- a/Source/core/css/CSSParser.cpp
+++ b/Source/core/css/CSSParser.cpp
@@ -10218,6 +10218,11 @@ inline void CSSParser::detectAtToken(int length, bool hasEscape)
         }
         return;
 
+    case 'v':
+        if (length == 9 && isEqualToCSSIdentifier(name + 2, "iewport"))
+            m_token = VIEWPORT_RULE_SYM;
+        return;
+
     case '-':
         switch (length) {
         case 15:
@@ -10251,14 +10256,6 @@ inline void CSSParser::detectAtToken(int length, bool hasEscape)
                 m_token = INTERNAL_VALUE_SYM;
             return;
 
-        case 17:
-            if (hasEscape)
-                return;
-
-            else if (isASCIIAlphaCaselessEqual(name[16], 't') && isEqualToCSSIdentifier(name + 2, "webkit-viewpor"))
-                m_token = WEBKIT_VIEWPORT_RULE_SYM;
-            return;
-
         case 18:
             if (isEqualToCSSIdentifier(name + 2, "webkit-keyframes"))
                 m_token = WEBKIT_KEYFRAMES_SYM;