Remove ChromeBrowserProvider::CreateSyncedWindowDelegatesGetter().

ios/chrome/browser/downstream_chromium_browser_provider.h

Index: ios/chrome/browser/downstream_chromium_browser_provider.h
diff --git a/ios/chrome/browser/downstream_chromium_browser_provider.h b/ios/chrome/browser/downstream_chromium_browser_provider.h
index 94132199f192b12017f8eced6c474bd858eb9ba6..acfadeb27168aea6aac246e3d15dbc161964852d 100644
--- a/ios/chrome/browser/downstream_chromium_browser_provider.h
+++ b/ios/chrome/browser/downstream_chromium_browser_provider.h
@@ -16,13 +16,6 @@ class DownstreamChromiumBrowserProvider : public ChromiumBrowserProvider {
   ~DownstreamChromiumBrowserProvider() override;
 
  private:
-  // ChromeBrowserProvider implementations.  All of these will move upstream
-  // into ChromiumBrowserProvider eventually, and from there callers will be
-  // converted to not go through the provider API at all.
-  std::unique_ptr<sync_sessions::SyncedWindowDelegatesGetter>
-  CreateSyncedWindowDelegatesGetter(
-      ios::ChromeBrowserState* browser_state) override;
-
   DISALLOW_COPY_AND_ASSIGN(DownstreamChromiumBrowserProvider);
 };