fix: Change Marker in blockly.js becuase of the usage of the Marker c…

…lass as a named export (google#5629)

Fixed marker as per style guide and the export of tabnavigator as well.

Fixes google#5606.

core/blockly.js

@@ -21,10 +21,8 @@ const ContextMenuItems = goog.require('Blockly.ContextMenuItems');
 const Css = goog.require('Blockly.Css');
 const Events = goog.require('Blockly.Events');
 const Extensions = goog.require('Blockly.Extensions');
-const Marker = goog.require('Blockly.Marker');
 const Procedures = goog.require('Blockly.Procedures');
 const ShortcutItems = goog.require('Blockly.ShortcutItems');
-const TabNavigateCursor = goog.require('Blockly.TabNavigateCursor');
 const Themes = goog.require('Blockly.Themes');
 const Tooltip = goog.require('Blockly.Tooltip');
 const Touch = goog.require('Blockly.Touch');
@@ -124,6 +122,7 @@ const {IToolbox} = goog.require('Blockly.IToolbox');
 const {Icon} = goog.require('Blockly.Icon');
 const {Input} = goog.require('Blockly.Input');
 const {InsertionMarkerManager} = goog.require('Blockly.InsertionMarkerManager');
+const {Marker} = goog.require('Blockly.Marker');
 const {MarkerManager} = goog.require('Blockly.MarkerManager');
 const {MenuItem} = goog.require('Blockly.MenuItem');
 const {Menu} = goog.require('Blockly.Menu');
@@ -136,6 +135,7 @@ const {ScrollbarPair} = goog.require('Blockly.ScrollbarPair');
 const {Scrollbar} = goog.require('Blockly.Scrollbar');
 const {ShortcutRegistry} = goog.require('Blockly.ShortcutRegistry');
 const {Size} = goog.require('Blockly.utils.Size');
+const {TabNavigateCursor} = goog.require('Blockly.TabNavigateCursor');
 const {ThemeManager} = goog.require('Blockly.ThemeManager');
 const {Theme} = goog.require('Blockly.Theme');
 const {ToolboxCategory} = goog.require('Blockly.ToolboxCategory');