DevTools: add more jsdocs to NetworkPanel.

Source/devtools/front_end/sources/JavaScriptSourceFrame.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 406 matching lines @@
     {
         var breakpoints = this._breakpointManager.breakpointsForUISourceCode(this._uiSourceCode);
         for (var i = 0; i < breakpoints.length; ++i)
             breakpoints[i].remove();
     },
 
     _getPopoverAnchor: function(element, event)
     {
         var target = WebInspector.context.flavor(WebInspector.Target);
         if (!target || !target.debuggerModel.isPaused())
-            return null;
+            return;
 
         var textPosition = this.textEditor.coordinatesToCursorPosition(event.x, event.y);
         if (!textPosition)
-            return null;
+            return;
         var mouseLine = textPosition.startLine;
         var mouseColumn = textPosition.startColumn;
         var textSelection = this.textEditor.selection().normalize();
         if (textSelection && !textSelection.isEmpty()) {
             if (textSelection.startLine !== textSelection.endLine || textSelection.startLine !== mouseLine || mouseColumn < textSelection.startColumn || mouseColumn > textSelection.endColumn)
-                return null;
+                return;
 
             var leftCorner = this.textEditor.cursorPositionToCoordinates(textSelection.startLine, textSelection.startColumn);
             var rightCorner = this.textEditor.cursorPositionToCoordinates(textSelection.endLine, textSelection.endColumn);
             var anchorBox = new AnchorBox(leftCorner.x, leftCorner.y, rightCorner.x - leftCorner.x, leftCorner.height);
             anchorBox.highlight = {
                 lineNumber: textSelection.startLine,
                 startColumn: textSelection.startColumn,
                 endColumn: textSelection.endColumn - 1
             };
             anchorBox.forSelection = true;
             return anchorBox;
         }
 
         var token = this.textEditor.tokenAtTextPosition(textPosition.startLine, textPosition.startColumn);
         if (!token)
-            return null;
+            return;
         var lineNumber = textPosition.startLine;
         var line = this.textEditor.line(lineNumber);
         var tokenContent = line.substring(token.startColumn, token.endColumn + 1);
 
         var isIdentifier = token.type.startsWith("js-variable") || token.type.startsWith("js-property") || token.type == "js-def";
         if (!isIdentifier && (token.type !== "js-keyword" || tokenContent !== "this"))
-            return null;
+            return;
 
         var leftCorner = this.textEditor.cursorPositionToCoordinates(lineNumber, token.startColumn);
         var rightCorner = this.textEditor.cursorPositionToCoordinates(lineNumber, token.endColumn + 1);
         var anchorBox = new AnchorBox(leftCorner.x, leftCorner.y, rightCorner.x - leftCorner.x, leftCorner.height);
 
         anchorBox.highlight = {
             lineNumber: lineNumber,
             startColumn: token.startColumn,
             endColumn: token.endColumn
         };
@@ skipping 368 matching lines @@
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.ConsoleMessageRemoved, this._consoleMessageRemoved, this);
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.ConsoleMessagesCleared, this._consoleMessagesCleared, this);
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.SourceMappingChanged, this._onSourceMappingChanged, this);
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyChanged, this._workingCopyChanged, this);
         this._uiSourceCode.removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyCommitted, this._workingCopyCommitted, this);
         WebInspector.UISourceCodeFrame.prototype.dispose.call(this);
     },
 
     __proto__: WebInspector.UISourceCodeFrame.prototype
 }