[ios] Implements even more of ChromiumBrowserProvider.

ios/chrome/browser/providers/chromium_browser_provider.h

Index: ios/chrome/browser/providers/chromium_browser_provider.h
diff --git a/ios/chrome/browser/providers/chromium_browser_provider.h b/ios/chrome/browser/providers/chromium_browser_provider.h
index 14187992e7d6125873c0e49a7b3858e474bcd0c4..f2a501c7b1c891f4e4b0d7214dc5f9f5fc659a76 100644
--- a/ios/chrome/browser/providers/chromium_browser_provider.h
+++ b/ios/chrome/browser/providers/chromium_browser_provider.h
@@ -25,9 +25,11 @@ class ChromiumBrowserProvider : public ios::ChromeBrowserProvider {
                                   id<UrlLoader> loader) const override
       NS_RETURNS_RETAINED;
   UserFeedbackProvider* GetUserFeedbackProvider() const override;
+  AppDistributionProvider* GetAppDistributionProvider() const override;
   BrandedImageProvider* GetBrandedImageProvider() const override;
 
  private:
+  std::unique_ptr<AppDistributionProvider> app_distribution_provider_;
   std::unique_ptr<BrandedImageProvider> branded_image_provider_;
   std::unique_ptr<ios::SigninErrorProvider> signin_error_provider_;
   std::unique_ptr<ios::SigninResourcesProvider> signin_resources_provider_;