Update DCHECK in WebRange constructor.

third_party/WebKit/Source/web/WebRange.cpp

Index: third_party/WebKit/Source/web/WebRange.cpp
diff --git a/third_party/WebKit/Source/web/WebRange.cpp b/third_party/WebKit/Source/web/WebRange.cpp
index 05d91f098aafac098cdf3bad9786d932ab18c372..f850170d2c53e64d4235b28c1418b89fde39607e 100644
--- a/third_party/WebKit/Source/web/WebRange.cpp
+++ b/third_party/WebKit/Source/web/WebRange.cpp
@@ -42,7 +42,7 @@ WebRange::WebRange(int start, int length)
     : m_start(start)
     , m_end(start + length)
 {
-    DCHECK(start != -1 && length != 0) << "These values are reserved to indicate that the range is null";
+    DCHECK(start != -1 || length != 0) << "These values are reserved to indicate that the range is null";
 }
 
 WebRange::WebRange(const EphemeralRange& range)