[ios] Adds OmahaServiceProvider.

ios/public/provider/chrome/browser/chrome_browser_provider.h

Index: ios/public/provider/chrome/browser/chrome_browser_provider.h
diff --git a/ios/public/provider/chrome/browser/chrome_browser_provider.h b/ios/public/provider/chrome/browser/chrome_browser_provider.h
index 0f9f0467c917594e854bc50d092d56329b6955a5..4fddf0964bc5cb1a8fe403800582be8633e7d72b 100644
--- a/ios/public/provider/chrome/browser/chrome_browser_provider.h
+++ b/ios/public/provider/chrome/browser/chrome_browser_provider.h
@@ -21,6 +21,7 @@ class AppDistributionProvider;
 class AutocompleteProvider;
 class GURL;
 class InfoBarViewDelegate;
+class OmahaServiceProvider;
 class PrefRegistrySimple;
 class PrefService;
 class VoiceSearchProvider;
@@ -163,6 +164,9 @@ class ChromeBrowserProvider {
       ios::ChromeBrowserState* browser_state,
       id<UrlLoader> loader) const NS_RETURNS_RETAINED;
 
+  // Returns an instance of the omaha service provider.
+  virtual OmahaServiceProvider* GetOmahaServiceProvider() const;
+
   // Returns the SyncedWindowDelegatesGetter implementation.
   virtual std::unique_ptr<sync_sessions::SyncedWindowDelegatesGetter>
   CreateSyncedWindowDelegatesGetter(ios::ChromeBrowserState* browser_state);