Move SessionID, CaptureVisibleTabFunction to WebContents.

chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_api.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_EXTENSIONS_API_OFFSCREEN_TABS_OFFSCREEN_TABS_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_OFFSCREEN_TABS_OFFSCREEN_TABS_API_H_
 
 #include <string>
 
 #include "base/values.h"
@@ skipping 133 matching lines @@
  public:
   // TODO(jstritar): Rename to toDataUrl.
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.offscreenTabs.toDataUrl")
 
   ToDataUrlOffscreenTabFunction();
 
  protected:
   virtual ~ToDataUrlOffscreenTabFunction();
 
   // CaptureVisibleTabFunction:
-  virtual bool GetTabToCapture(content::WebContents** web_contents,
-                               TabContents** tab_contents) OVERRIDE;
+  virtual bool GetTabToCapture(content::WebContents** web_contents) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ToDataUrlOffscreenTabFunction);
 };
 
 // Updates an offscreen tab.
 class UpdateOffscreenTabFunction : public UpdateTabFunction {
  public:
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.offscreenTabs.update")
 
   UpdateOffscreenTabFunction();
 
  protected:
   virtual ~UpdateOffscreenTabFunction();
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 
   // UpdateTabFunction:
   virtual void PopulateResult() OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(UpdateOffscreenTabFunction);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_OFFSCREEN_TABS_OFFSCREEN_TABS_API_H_