Switch on-demand update checks to the less-old GoogleUpdate3 API.

chrome/browser/ui/webui/help/version_updater.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_WEBUI_HELP_VERSION_UPDATER_H_
 #define CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
 
 namespace content {
-class BrowserContext;
+class WebContents;
 }
 
 // Interface implemented to expose per-platform updating functionality.
 class VersionUpdater {
  public:
   // Update process state machine.
   enum Status {
     CHECKING,
     UPDATING,
     NEARLY_UPDATED,
@@ skipping 27 matching lines @@
 
 #if defined(OS_MACOSX)
   // Used to show or hide the promote UI elements.
   typedef base::Callback<void(PromotionState)> PromoteCallback;
 #endif
 
   virtual ~VersionUpdater() {}
 
   // Sub-classes must implement this method to create the respective
   // specialization.
-  static VersionUpdater* Create(content::BrowserContext* context);
+  static VersionUpdater* Create(content::WebContents* web_contents);
 
   // Begins the update process by checking for update availability.
   // |status_callback| is called for each status update. |promote_callback| can
   // be used to show or hide the promote UI elements.
   virtual void CheckForUpdate(const StatusCallback& status_callback

[S. Ganesh, 2015/05/13 20:21:41]

Perhaps mention here that HelpHandler::RequestUpdate calls this function in
response to the chrome://chrome page requesting an update check.

[grt (UTC plus 2), 2015/05/13 20:36:38]

I tend to not put that sort of things in code comments since a refactor could
change the caller without otherwise needing to touch this file. Codesearch is a
wonderful thing!

 #if defined(OS_MACOSX)
                               , const PromoteCallback& promote_callback
 #endif
                               ) = 0;
 
 #if defined(OS_MACOSX)
   // Make updates available for all users.
   virtual void PromoteUpdater() const = 0;
 #endif
 
   // Relaunches the browser, generally after being updated.
   virtual void RelaunchBrowser() const = 0;
 
 #if defined(OS_CHROMEOS)
   virtual void SetChannel(const std::string& channel,
                           bool is_powerwash_allowed) = 0;
   virtual void GetChannel(bool get_current_channel,
                           const ChannelCallback& callback) = 0;
 #endif
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_H_