DevTools: Use CodeMirror modes instead of highlight tokenizers

LayoutTests/inspector/editor/highlighter-test.js

-function initialize_HighlighterTests()
-{
-
-InspectorTest.dumpTextModel = function(textModel)
-{
-    var lines = [];
-    for (var i = 0; i < textModel.linesCount; ++i) {
-        var line = textModel.line(i);
-        var highlight = textModel.getAttribute(i, "highlight");
-        var result = (i + 1) + " : " + line + " :";
-        if (highlight) {
-            for (var j = 0; j < highlight.ranges.length; ++j) {
-                var range = highlight.ranges[j];
-                result += " " + range.token + "[" + range.startColumn + "-" + (range.endColumn + 1) + "]";
-            }
-        } else
-            result += " null";
-        lines.push(result);
-    }
-    InspectorTest.addResult(lines.join("\n"));
-};
-
-}