Fix assertion when parsing @namespace/@import with url(<bad-string-token>)

third_party/WebKit/Source/core/css/parser/CSSParserImpl.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSParserImpl.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSParserImpl.cpp b/third_party/WebKit/Source/core/css/parser/CSSParserImpl.cpp
index 543fd33aa6efe80885f4ed4fc1fd759f7d9a0bcc..ae32ea630f2c688fa5a30d682654e83318e8cbac 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserImpl.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserImpl.cpp
@@ -445,9 +445,9 @@ static AtomicString consumeStringOrURI(CSSParserTokenRange& range)
 
     CSSParserTokenRange contents = range.consumeBlock();
     const CSSParserToken& uri = contents.consumeIncludingWhitespace();
-    ASSERT(uri.type() == StringToken);
-    if (!contents.atEnd())
+    if (uri.type() == BadStringToken || !contents.atEnd())
         return AtomicString();
+    DCHECK_EQ(uri.type(), StringToken);
     return uri.value().toAtomicString();
 }