Add a unittest for SearchGeolocationService

chrome/browser/android/search_geolocation/search_geolocation_service.h

Index: chrome/browser/android/search_geolocation/search_geolocation_service.h
diff --git a/chrome/browser/android/search_geolocation/search_geolocation_service.h b/chrome/browser/android/search_geolocation/search_geolocation_service.h
index 93ba3e9d8263d49f7830f9078d38d2f07b53b344..351aac751c4750fc7883d03afd0aaf88e42b7765 100644
--- a/chrome/browser/android/search_geolocation/search_geolocation_service.h
+++ b/chrome/browser/android/search_geolocation/search_geolocation_service.h
@@ -66,10 +66,10 @@ class SearchGeolocationService : public KeyedService {
     bool ServiceIsCreatedWithBrowserContext() const override;
     KeyedService* BuildServiceInstanceFor(
         content::BrowserContext* profile) const override;
+    void RegisterProfilePrefs(
+        user_prefs::PrefRegistrySyncable* registry) override;
   };
 
-  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
-
   explicit SearchGeolocationService(Profile* profile);
 
   // Returns whether the DSE geolocation setting is applicable for geolocation
@@ -87,6 +87,7 @@ class SearchGeolocationService : public KeyedService {
   void Shutdown() override;
 
  private:
+  friend class SearchGeolocationServiceTest;
   struct PrefValue;
 
   ~SearchGeolocationService() override;