Convert TrackedPreferenceValidationDelegate into a mojo interface.

chrome/browser/safe_browsing/safe_browsing_service.h

Index: chrome/browser/safe_browsing/safe_browsing_service.h
diff --git a/chrome/browser/safe_browsing/safe_browsing_service.h b/chrome/browser/safe_browsing/safe_browsing_service.h
index 42efd31b6c2311263d1c873c9e5c6fe840666950..3db03c6e0fe5f960b7995f84abf9226334ed494e 100644
--- a/chrome/browser/safe_browsing/safe_browsing_service.h
+++ b/chrome/browser/safe_browsing/safe_browsing_service.h
@@ -34,7 +34,6 @@
 class PrefChangeRegistrar;
 class PrefService;
 class Profile;
-class TrackedPreferenceValidationDelegate;
 
 namespace content {
 class DownloadManager;
@@ -45,6 +44,12 @@ class URLRequest;
 class URLRequestContextGetter;
 }
 
+namespace prefs {
+namespace mojom {
+class TrackedPreferenceValidationDelegate;
+}
+}
+
 namespace safe_browsing {
 class ClientSideDetectionService;
 class DownloadProtectionService;
@@ -160,7 +165,7 @@ class SafeBrowsingService : public base::RefCountedThreadSafe<
   // Returns a preference validation delegate that adds incidents to the
   // incident reporting service for validation failures. Returns NULL if the
   // service is not applicable for the given profile.
-  std::unique_ptr<TrackedPreferenceValidationDelegate>
+  std::unique_ptr<prefs::mojom::TrackedPreferenceValidationDelegate>
   CreatePreferenceValidationDelegate(Profile* profile) const;
 
   // Registers |callback| to be run after some delay following process launch.