DevTools: [CodeMirror] roll codemirror to v4.4.1

LayoutTests/inspector/editor/editor-test.js

 function initialize_EditorTests()
 {
 
 InspectorTest.createTestEditor = function(clientHeight, textEditorDelegate)
 {
     runtime.loadModule("source_frame");
     var textEditor = new WebInspector.CodeMirrorTextEditor("", textEditorDelegate || new WebInspector.TextEditorDelegate());
-    if (clientHeight)
-        textEditor.element.style.height = clientHeight + "px";
+    clientHeight = clientHeight || 100;
+    textEditor.element.style.height = clientHeight + "px";
     textEditor.element.style.flex = "none";
     textEditor.show(WebInspector.inspectorView.element);
     return textEditor;
 };
 
 function textWithSelection(text, selections)
 {
     if (!selections.length)
         return text;
 
@@ skipping 147 matching lines @@
 
     function callbackWrapper()
     {
         editor._codeMirror.off("inputRead", callbackWrapper);
         callback();
     }
     editor._codeMirror.on("inputRead", callbackWrapper);
 }
 
 }