chrome::ShowTaskManager: refine return type to eliminate a downcast.

chrome/browser/ui/browser_dialogs.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_BROWSER_DIALOGS_H_
 #define CHROME_BROWSER_UI_BROWSER_DIALOGS_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 36 matching lines @@
 namespace gfx {
 class Image;
 class Point;
 }
 
 namespace net {
 class AuthChallengeInfo;
 class URLRequest;
 }
 
+namespace task_management {
+class TaskManagerTableModel;
+}
+
 namespace ui {
-class TableModel;
 class WebDialogDelegate;
 }
 
 namespace chrome {
 
 #if defined(OS_MACOSX)
 // Makes ToolkitViewsDialogsEnabled() available to chrome://flags.
 extern const base::Feature kMacViewsNativeDialogs;
 
 // Makes ToolkitViewsWebUIDialogsEnabled() available to chrome://flags.
 extern const base::Feature kMacViewsWebUIDialogs;
 #endif  // OS_MACOSX
 
 // Shows or hides the Task Manager. |browser| can be NULL when called from Ash.
 // Returns a pointer to the underlying TableModel, which can be ignored, or used
 // for testing.
-ui::TableModel* ShowTaskManager(Browser* browser);
+task_management::TaskManagerTableModel* ShowTaskManager(Browser* browser);
 void HideTaskManager();
 
 #if !defined(OS_MACOSX)
 // Creates and shows an HTML dialog with the given delegate and context.
 // The window is automatically destroyed when it is closed.
 // Returns the created window.
 //
 // Make sure to use the returned window only when you know it is safe
 // to do so, i.e. before OnDialogClosed() is called on the delegate.
 gfx::NativeWindow ShowWebDialog(gfx::NativeView parent,
@@ skipping 39 matching lines @@
 // bookmark star is clicked or "Bookmark This Page..." is selected from a menu
 // or via a key equivalent.
 void ShowBookmarkBubbleViewsAtPoint(const gfx::Point& anchor_point,
                                     gfx::NativeView parent,
                                     bookmarks::BookmarkBubbleObserver* observer,
                                     Browser* browser,
                                     const GURL& url,
                                     bool newly_bookmarked);
 
 // Bridging methods that show/hide the toolkit-views based Task Manager on Mac.
-ui::TableModel* ShowTaskManagerViews(Browser* browser);
+task_management::TaskManagerTableModel* ShowTaskManagerViews(Browser* browser);
 void HideTaskManagerViews();
 
 // Notifies the old task manager with network bytes read events when the Mac
 // views are not used.
 bool NotifyOldTaskManagerBytesRead(const net::URLRequest& request,
                                    int64_t bytes_read);
 
 #endif  // OS_MACOSX
 
 #if defined(TOOLKIT_VIEWS)
@@ skipping 35 matching lines @@
 void(*)(content::NavigationHandle*,
         const std::vector<std::pair<std::basic_string<char>, gfx::Image> >&,
         const base::Callback<void(size_t,
                                   arc::ArcNavigationThrottle::CloseReason)>&);
 
 BubbleShowPtr ShowIntentPickerBubble();
 
 #endif  // OS_CHROMEOS
 
 #endif  // CHROME_BROWSER_UI_BROWSER_DIALOGS_H_