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 a1085b934e9408189a152f6bdf297fe45aa4de27..49b5e4e9be6a902d6ec1d664fc4eacaabb57ecaa 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;
@@ -163,7 +168,7 @@ 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.