Wholesale move of debugger sources to content.

content/browser/debugger/manual_tests/console-call-line-numbers.html

 <script>
     console.info("Test console.info");
     console.log("Test console.log");
     console.warn("Test console.warn");
     console.error("Test console.error");
     console.time("Test console.time");
     console.timeEnd("Test console.time");
     console.count("Test console.count");
     console.assert(false, "Test console.assert");
 </script>
 <script src="resources/script-console-calls.js"></script>
 
 <p>To test, open the DevTools's Console (Ctrl+Shift+J) and verify that all console messages have correct
 resource URLs and line numbers. Also verify that errors and warnings show up inline as bubbles in the
 Resource panel file list and each individual resource view.</p>