[Sync] Remove static methods on SyncedWindowDelegate.

chrome/browser/sync/sessions/synced_window_delegates_getter.h

 // Copyright 2014 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_SYNC_SESSIONS_SYNCED_WINDOW_DELEGATES_GETTER_H_
 #define CHROME_BROWSER_SYNC_SESSIONS_SYNCED_WINDOW_DELEGATES_GETTER_H_
 
 #include <set>
+
 #include "base/macros.h"
+#include "components/sessions/session_id.h"
 
 namespace browser_sync {
 
 class SyncedWindowDelegate;
 
 class SyncedWindowDelegatesGetter {
  public:
   SyncedWindowDelegatesGetter();
   virtual ~SyncedWindowDelegatesGetter();
-  virtual std::set<const SyncedWindowDelegate*> GetSyncedWindowDelegates();
+  virtual std::set<const SyncedWindowDelegate*> GetSyncedWindowDelegates() = 0;

[Nicolas Zea, 2015/08/31 22:12:47]

nit: although it didn't have them before, would be good to add comments here
explaining what these two methods are for (and to add a comment to the class
explaining what it's purpose is)

[maxbogue, 2015/09/01 17:29:28]

Done.

+  virtual const SyncedWindowDelegate* FindById(SessionID::id_type id) = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncedWindowDelegatesGetter);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SYNCED_WINDOW_DELEGATES_GETTER_H_