Wholesale move of debugger sources to content.

content/browser/debugger/manual_tests/debugger-step-on-for-statements.html

 <script src="resources/loop-statements.js"></script>
 <script>        
 function runFor()
 {
     /* place breakpoint on next line and click continue */ debugger;
     for (initialize(); condition(); increment())
         statement();
 }
 </script>
 <p>To test, open the DevTools (Ctrl+Shift+I) and reload the page.
 <br><br>
 Before running the tests please perform the following:
 Make sure the execution is not paused in the debugger.<br>
 Click the button and when the debugger breaks, set a breakpoint on the first line in the loop
 (as indicated by the comment), and click continue.<br>
 The debugger should stop at the beggining of the loop.<br>
 The above actions should be performed before <b>each</b> of the following tests.</p>
 <br><br>
 <input type="button" value="run for" onclick="runFor()"/>
 <br><br>
 TEST 1: Click 'continue'. Execution should continue without stopping on the loop breakpoint again.<br>
 TEST 2: Click 'Step over'. Debugger should step inside the loop to the next statement line.<br>
 TEST 3: Click 'Step into'. Debugger should step into 'initialize' function. Click 'Step into' until
 outside of the 'initialize' function - debugger should enter the 'condition' function.<br>
 function.<br>