Revert of Removed support deprecated (//@|/*@) source(URL|MappingURL)=

src/scanner.cc

Index: src/scanner.cc
diff --git a/src/scanner.cc b/src/scanner.cc
index f6e354a23c2e91d7fdbdf7c6d6385c9b99421ef9..7e429718ec96c5e56b1dc17121bf64543f5fd768 100644
--- a/src/scanner.cc
+++ b/src/scanner.cc
@@ -356,7 +356,7 @@
 
 
 void Scanner::TryToParseSourceURLComment() {
-  // Magic comments are of the form: //[#]\s<name>=\s*<value>\s*.* and this
+  // Magic comments are of the form: //[#@]\s<name>=\s*<value>\s*.* and this
   // function will just return if it cannot parse a magic comment.
   if (c0_ < 0 || !unicode_cache_->IsWhiteSpace(c0_)) return;
   Advance();
@@ -574,7 +574,7 @@
         Advance();
         if (c0_ == '/') {
           Advance();
-          if (c0_ == '#') {
+          if (c0_ == '@' || c0_ == '#') {
             Advance();
             token = SkipSourceURLComment();
           } else {