DevTools: rename debugger/ to devtools/, move DevTools files into content/renderer/devtools.

content/browser/debugger/manual_tests/debugger-watch-expressions.html

-<p>Test for watched expression</p>
-
-<p>To begin test, open DevTools, go the Scripts Panel 
-and then click this link: <a href="javascript:runTest()">[begin test]</a>.
-
-<p>Perform the following steps, and note the expected results:
-    
-<ol>
-    
-<li><p>After clicking the link above, you should now be paused in the body of 
-the test method, thanks to the <code>debugger</code> statement.
-
-<li><p>Add the following expressions to the "Watch Expressions" section of the
-Scripts panel sidebar pane: "<code>this</code>", "<code>a</code>", 
-"<code>b</code>", "<code>c</code>" and "<code>d</code>". Do <b>NOT</b> enter the quotes.
-
-<li><p>The values of the expressions as shown in the window should be 
-<code>Object</code> for <code>this</code>, <code>undefined</code> for
-the <code>a</code>, <code>b</code>, and <code>c</code> variables, and a 
-value of <code>ReferenceError: d is not defined</code>
-for the <code>d</code> variable.
-
-<li><p>Note that the value for <code>d</code> should not change for the life of 
-the test, as the variable <code>d</code> is never introduced in the program.
-
-<li><p>Step through the code, and you'll see the values of <code>a</code>,
-<code>b</code>, and <code>c</code> change, as the variables are assigned.
-Also note that as the scope changes due to the function invocation, values
-will be changed to refer to their current scope.  The <code>this</code>
-expression will change when the method is invoked on the object constructed by
-the test.
-
-<li><p>Click different stack frames in the Call Stack section to ensure the
-expressions change value appropriately as the current stack frame changes.
-
-</ol>
-
-<script>
-function runTest() {
-    
-    // a nested function
-    function subFunction() {
-        debugger;
-        var a = "a in subFunction()";
-        
-        subSubFunction();
-        
-        // another nested function
-        function subSubFunction() {
-            debugger;
-            var b = "b in subSubFunction()";
-        }
-    }
-    
-    // a class
-    function aClass() {
-        this.x = "xxx";
-        this.y = "yyy";
-    }
-    
-    aClass.prototype.aMethod = function() {
-        debugger;
-        var c = "c in aMethod()";
-    }
-    
-    // main logic
-    debugger;
-    
-    var a = "a in runTest()";
-    var b = "b in runTest()";
-    var c = "c in runTest()";
-    
-    subFunction();
-    
-    var object = new aClass();
-    object.aMethod();
-    
-}
-</script>