Disallow an empty host in a CSP host-source directive

Source/core/frame/csp/CSPSourceList.cpp

Index: Source/core/frame/csp/CSPSourceList.cpp
diff --git a/Source/core/frame/csp/CSPSourceList.cpp b/Source/core/frame/csp/CSPSourceList.cpp
index a102ca4726a93ebb8c1dfaf20d72083622488433..9cf7753faf3a5a96483740769d60a0805afa940f 100644
--- a/Source/core/frame/csp/CSPSourceList.cpp
+++ b/Source/core/frame/csp/CSPSourceList.cpp
@@ -212,7 +212,7 @@ bool CSPSourceList::parseSource(const UChar* begin, const UChar* end, String& sc
                 || !skipExactly<UChar>(position, end, '/'))
                 return false;
             if (position == end)
-                return true;
+                return false;
             beginHost = position;
             skipWhile<UChar, isNotColonOrSlash>(position, end);
         }