Issue 1772 - [JSHydra] Convert const to var for Chrome

scripts/abprewrite.js

 // This script rewrites AST to be compatible with JavaScript 1.5 and decompiles
 // the modified tree then
 
 include("../scripts/astDecompile.js");
 include("../utils/beautify.js");
 
 let headerPrinted = false;
 
 // See https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API for
 // AST structure.
@@ skipping 194 matching lines @@
     for (let i = 0; i < vars.length; i++)
       if (vars[i])
         block.body.push(Assignment(vars[i], Member(tempVar, i, true)));
     return block;
   }
   return ast;
 }
 
 function modifyVariableDeclaration(ast)
 {
-  // Convert let variables:
+  // Convert let and const variables:
   // let foo = bar;
+  // const bas = 4;
   //
   // Change into:
   // var foo = bar;
-  if (ast.kind == "let")
+  // var bas = 4;
+  if (ast.kind == "let" || ast.kind == "const")
     ast.kind = "var";
 
   if (ast.declarations.length == 1 && ast.declarations[0].type == "VariableDeclarator")
   {
     let declarator = ast.declarations[0];
 
     // Remove timeline requires:
     // let {Timeline} = require("timeline");
     if (declarator.init && decompileAST(declarator.init) == 'require("timeline")')
       return null;
@@ skipping 337 matching lines @@
     let code = 'require.scopes["' + options.filename + '"] = (function() {\n' +
                'var exports = {};\n' +
                decompileAST(ast) +
                'return exports;\n' +
                '})();\n';
     _print(js_beautify(code, options));
   }
   else
     _print(js_beautify(decompileAST(ast), options));
 }